- Herbal teas, or tisanes, are infusions made from herbs, flowers, fruits, or spices steeped in hot water, distinct from traditional teas derived from the Camellia sinensis plant.
- Certain herbal teas, such as chamomile, valerian root, and lavender, have been traditionally used to promote relaxation and improve sleep quality.
- However, scientific evidence supporting their effectiveness is limited, and more research is needed to confirm their benefits.
Herbal tea is a caffeine-free beverage made by steeping a blend of herbs, flowers, seeds, or roots in hot water, often used for its medicinal properties (1). Many individuals turn to herbal teas as natural remedies for improving sleep quality. Teas like chamomile, valerian root, and passionflower have demonstrated effectiveness in reducing sleep disturbances and enhancing overall restfulness. For instance, chamomile tea is renowned for its mild sedative effects, contributing to reduced sleep latency and improved REM sleep quality (2). Similarly, passionflower tea has been shown to improve subjective sleep quality through its anxiolytic properties (3). Lemon balm and lavender teas also offer sleep-supportive benefits, leveraging their calming and neuroregulatory effects (4). Emerging evidence supports the utility of such teas in alleviating prolonged fatigue and mitigating insomnia symptoms (5). As herbal teas are rooted in traditional medicine, they are increasingly validated by modern research, highlighting their role in promoting holistic sleep health (6).
Understanding the Connection Between Herbal Teas and Sleep
The connection between herbal teas and sleep is rooted in the calming and therapeutic properties of certain plant-based ingredients. Similarly, valerian root tea enhances sleep quality by modulating the gamma-aminobutyric acid (GABA) system, which plays a critical role in calming the nervous system (7). Passionflower tea is also well-documented for its efficacy in reducing anxiety and improving sleep cycles through its effects on GABA (8). Lemon balm and lavender teas have also been studied for their ability to reduce restlessness and induce a state of calm, making them popular choices among herbal remedies (9). Furthermore, the polyphenols in herbal teas may positively impact the gut microbiome, indirectly supporting sleep regulation (10). Ongoing studies also highlight the importance of combining multiple herbs, such as hops and ashwagandha, to amplify these effects (11). Collectively, these findings reinforce the role of herbal teas as natural sleep aids with multifaceted benefits (12).
Which Herbal Teas Support Sleep Quality?
In today’s fast-paced world, achieving restful sleep can be challenging. Many individuals turn to natural remedies like herbal teas to enhance sleep quality. Herbal teas such as chamomile, valerian root, lavender, and passionflower are renowned for their calming properties, which may promote relaxation and improve sleep. Incorporating these teas into your nightly routine could serve as a soothing ritual to help you unwind and prepare for a good night’s rest.
1. Chamomile Tea
Chamomile tea, derived from the dried flowers of Matricaria chamomilla, is widely recognized for its soothing effects and its role in improving sleep quality. The herb contains apigenin, a bioactive compound that binds to specific brain receptors to reduce anxiety and promote relaxation, thereby facilitating better sleep (1). Clinical trials have shown that chamomile tea significantly enhances sleep latency and overall sleep efficiency, particularly in populations with mild insomnia (13). It has been found to be especially beneficial for elderly individuals and postpartum women experiencing disrupted sleep patterns, leading to notable improvements in subjective sleep quality (2). Furthermore, its ability to alleviate mild depression and reduce fatigue adds to its therapeutic benefits, making it an effective natural remedy for holistic well-being (14).
Side Effects
While chamomile tea is generally considered safe, it can cause mild adverse effects in some individuals. Allergic reactions are the most common, particularly among people sensitive to plants in the daisy family, such as ragweed (15). Rarely, chamomile may lead to nausea or dizziness, especially if consumed in large quantities (4). Interaction with medications is another concern; for example, chamomile might amplify the effects of blood thinners or sedatives (6). Pregnant women are advised to consult healthcare providers before using chamomile, as high doses could potentially pose risks (16). Awareness and moderation in its use can ensure its benefits outweigh these minimal risks.
2. Valerian Root Tea
Valerian root tea, derived from the roots of Valeriana officinalis, has long been recognized for its sedative properties and its ability to enhance sleep quality. The active compounds in valerian, including valerenic acid and valepotriates, interact with gamma-aminobutyric acid (GABA) receptors in the brain, helping to reduce anxiety and promote restful sleep (17). Clinical trials have shown that valerian can improve sleep latency and sleep efficiency, making it particularly effective for individuals with insomnia or stress-induced sleep issues (4). Additionally, the tea is known for its ability to enhance overall well-being by alleviating symptoms of mild depression and chronic fatigue, contributing to a holistic approach to sleep management (18).
Side Effects
While valerian root tea is generally safe, it can cause some side effects in certain individuals. Common issues include mild dizziness, headaches, and digestive disturbances, particularly when consumed in large amounts (19). Some studies also indicate potential interactions with sedatives and alcohol, leading to amplified sedative effects, which should be considered by those taking other medications (20). Additionally, allergic reactions are rare but possible, particularly for individuals with sensitivities to related herbal compounds (18). As a precaution, pregnant and breastfeeding women are advised to consult healthcare providers before using valerian root tea (21).
3. Lavender Tea
Lavender tea, made from the blossoms of the Lavandula angustifolia plant, is renowned for its calming properties and its ability to promote sleep quality. The active compounds in lavender, such as linalool and linalyl acetate, work on the nervous system to reduce stress and anxiety, thereby facilitating restful sleep (22). Studies have demonstrated that lavender tea significantly improves sleep duration and reduces sleep disturbances in individuals with insomnia (23). It has also been shown to alleviate postpartum depression and enhance sleep quality in new mothers (24). Beyond sleep benefits, lavender tea supports holistic well-being by relieving symptoms of fatigue and enhancing relaxation, making it a preferred herbal remedy for stress-related disorders (25).
Side Effects
While lavender tea is generally safe for most people, it can cause some side effects, especially in those who are sensitive to lavender or related plants. Allergic reactions, though rare, may include skin irritation, dizziness, or gastrointestinal discomfort (26). Additionally, excessive consumption may lead to sedative effects, which could impair alertness or coordination (27). Pregnant and breastfeeding women are advised to consult healthcare professionals before using lavender tea due to potential hormonal interactions (28). Moreover, lavender may interact with sedative medications, amplifying their effects, so caution is necessary for those on such treatments (3).
4. Passionflower Tea
Passionflower tea, derived from the Passiflora incarnata plant, is widely celebrated for its calming properties and its role in enhancing sleep quality. The tea works primarily by increasing the levels of gamma-aminobutyric acid (GABA) in the brain, which helps to lower brain activity, promoting relaxation and sleep (3). Clinical studies show that consuming passionflower tea can significantly improve subjective sleep quality, especially for individuals experiencing mild sleep disturbances (29). Additionally, it is effective in reducing symptoms of anxiety and stress, which are common barriers to restful sleep (30). Research also highlights its non-addictive properties, making it a safer alternative to pharmacological sedatives (31). These characteristics make passionflower tea a holistic option for improving sleep without interfering with natural sleep cycles (5).
Side Effects
Although passionflower tea is generally safe for most individuals, it can cause mild side effects in some cases. Common issues include dizziness, confusion, or an upset stomach, particularly when consumed in large quantities (3). Pregnant or breastfeeding women should avoid passionflower tea due to its potential to induce uterine contractions (21). Additionally, it may interact with certain medications, such as sedatives and blood thinners, potentially amplifying their effects (5). Rarely, allergic reactions can occur, particularly in individuals with plant sensitivities (30). To minimize risks, it is advisable to consume passionflower tea in moderation and consult a healthcare professional before use.
5. Lemon Balm Tea
Lemon balm tea, made from the Melissa officinalis plant, is known for its calming properties and its ability to improve sleep quality. Its active compounds, such as rosmarinic acid, enhance gamma-aminobutyric acid (GABA) activity in the brain, reducing anxiety and stress while promoting relaxation (1). Clinical studies indicate that regular consumption of lemon balm tea can decrease the time it takes to fall asleep and extend sleep duration, particularly in individuals with mild insomnia (32). The tea is also effective for reducing sleep disturbances associated with menopause and postpartum stress, making it a versatile natural remedy (33). Furthermore, its soothing effects contribute to improved mood and cognitive function, enhancing overall well-being (34).
Side Effects
While lemon balm tea is generally safe for most individuals, it can cause mild side effects such as nausea, dizziness, or gastrointestinal discomfort in rare cases (35). Overconsumption may lead to excessive sedation, especially when combined with other sedatives or medications affecting the central nervous system (36). Pregnant and breastfeeding women should exercise caution, as the safety of lemon balm during these periods has not been fully established (37). Individuals with thyroid disorders should also consult a healthcare provider before using lemon balm, as it may interfere with thyroid hormone levels (38).
6. Peppermint Tea
Peppermint tea, derived from the leaves of Mentha piperita, is known for its soothing effects on digestion and its potential to enhance sleep quality. It contains menthol, which has a cooling effect on the body, promoting relaxation and reducing discomfort that may interfere with sleep (39). Research indicates that peppermint tea may alleviate tension headaches and reduce stress levels, which can indirectly improve sleep quality (40). Additionally, studies have demonstrated that the tea’s calming properties can benefit individuals experiencing mild insomnia by relaxing the digestive system and promoting a sense of calm (41). Its caffeine-free nature makes it an excellent option for nighttime consumption, supporting restful and uninterrupted sleep (42).
Side Effects
While peppermint tea is generally safe, it may cause mild adverse effects in some individuals. Excessive consumption can lead to heartburn or exacerbate acid reflux due to the tea’s relaxing effect on the lower esophageal sphincter (43). People with allergies to mint plants or gastrointestinal conditions like GERD should avoid peppermint tea (44). Additionally, interactions with certain medications, such as antacids or blood sugar-lowering drugs, should be considered (45). Moderation is key to reaping the benefits of peppermint tea without experiencing its side effects.
7. Rooibos Tea
Rooibos tea, a naturally caffeine-free beverage derived from the Aspalathus linearis plant, is widely praised for its ability to promote relaxation and support sleep quality. It contains high levels of antioxidants, such as aspalathin and quercetin, which help reduce oxidative stress, a common factor in sleep disturbances (46). Research suggests that rooibos tea can improve sleep duration and decrease nighttime awakenings, making it particularly beneficial for individuals experiencing mild insomnia (47). Additionally, the calming effect of rooibos tea supports the regulation of cortisol, the stress hormone, thereby enhancing relaxation before bedtime (48). As it lacks caffeine and tannins, rooibos tea is a safe choice for those who are sensitive to stimulants (49).
Side Effects
Although rooibos tea is generally well-tolerated, excessive consumption may lead to mild side effects, such as an upset stomach or increased liver enzyme levels in rare cases (50). Individuals with plant allergies should exercise caution, as allergic reactions, though rare, have been reported (51). Pregnant or breastfeeding women are advised to consult their healthcare providers before consuming rooibos tea due to limited studies on its safety during pregnancy (52). Furthermore, individuals with existing liver or kidney conditions should use rooibos tea in moderation (53). Despite these rare side effects, rooibos tea remains a favorable option for supporting sleep.
8. Ashwagandha Tea
Ashwagandha tea, derived from the Withania somnifera plant, is a renowned adaptogenic beverage in Ayurvedic medicine that helps improve sleep quality by reducing stress and anxiety levels. The active compound, withanolides, has been shown to regulate cortisol production, helping individuals achieve deeper and more restful sleep (54). Clinical studies have indicated that regular consumption of ashwagandha can decrease sleep latency and enhance overall sleep duration (55). Additionally, ashwagandha’s neuroprotective properties may improve cognitive function and reduce fatigue, further supporting holistic sleep health (56). Its ability to stabilize blood sugar levels and support the nervous system makes it an excellent choice for individuals with insomnia and chronic stress (57).
Side Effects
Although ashwagandha tea is generally safe for most people, excessive consumption can lead to mild side effects such as stomach upset, diarrhea, or headaches (4). It may interact with medications like sedatives, thyroid treatments, or immunosuppressants, so caution is advised for individuals on such drugs (58). Pregnant or breastfeeding women should avoid ashwagandha tea, as its effects during pregnancy are not fully understood (59). Rare allergic reactions, though uncommon, can include skin rash or respiratory issues (60). Moderation and consultation with a healthcare provider are recommended to maximize its benefits and minimize risks.
9. Hops Tea
Hops tea, made from the flowers of the Humulus lupulus plant, is a natural remedy renowned for its calming and sedative properties. The active compounds in hops, such as xanthohumol and humulone, act on the gamma-aminobutyric acid (GABA) receptors in the brain to reduce anxiety and promote relaxation, leading to improved sleep quality (61). Studies have shown that hops tea can decrease sleep latency and enhance sleep duration, especially when combined with valerian root (6). This herbal tea is particularly beneficial for individuals with mild insomnia and stress-related sleep disturbances (62). Furthermore, its anti-inflammatory and antioxidant properties contribute to overall health, making it a holistic choice for improving both mental and physical well-being (63).
Side Effects
While hops tea is generally safe, it may cause mild side effects such as dizziness, stomach discomfort, or an allergic reaction in individuals sensitive to plants in the Cannabaceae family (64). Excessive consumption can lead to heightened sedation, which could interfere with daily activities and cognitive functions (65). Additionally, hops may interact with sedatives, antidepressants, or alcohol, amplifying their effects and potentially leading to adverse reactions (12). Pregnant and breastfeeding women are advised to avoid hops tea, as its effects on hormonal balance and pregnancy are not fully understood (66). Moderation and consultation with a healthcare provider are recommended for safe and effective use.
How to Choose the Right Herbal Tea for Sleep?
In today’s fast-paced world, achieving restful sleep can be challenging. Many individuals turn to natural remedies like herbal teas to enhance sleep quality. Herbal teas such as chamomile, valerian root, lavender, and passionflower are renowned for their calming properties, which may promote relaxation and improve sleep. Incorporating these teas into your nightly routine could serve as a soothing ritual to help you unwind and prepare for a good night’s rest.
- Identify Your Sleep Needs
Selecting the appropriate herbal tea for sleep starts with understanding your specific sleep challenges. For stress-related insomnia, chamomile tea is highly effective due to its calming properties (22). Passionflower tea is excellent for reducing anxiety-induced disturbances (29). If hormonal imbalances affect your sleep, lemon balm is an ideal choice (32). Ashwagandha tea works well for individuals experiencing chronic stress by regulating cortisol levels (4). For digestive discomfort, peppermint tea is a preferred option (6). - Consider Caffeine-Free Options
Choosing caffeine-free herbal teas is crucial for improving sleep, as caffeine can disrupt sleep patterns and delay the onset of deep sleep (67). Rooibos tea, rich in antioxidants and naturally caffeine-free, supports relaxation without stimulating the nervous system (68). Peppermint and chamomile teas are also excellent options for evening consumption due to their calming effects (69). Selecting teas free from caffeine ensures they complement the body’s natural sleep-wake cycle, aiding in uninterrupted rest (70). - Check for Possible Allergies
Before choosing an herbal tea for sleep, it’s essential to check for possible allergies. Chamomile, for instance, may cause reactions in individuals allergic to plants like ragweed (71). Peppermint and lemon balm may also trigger sensitivity in some people (72). - Avoid Interactions with Medications
When choosing herbal teas for sleep, it’s crucial to avoid interactions with medications. St. John’s Wort, often used for relaxation, can interfere with antidepressants (73). Peppermint tea may affect the efficacy of antacids (74). Consultation with a healthcare provider ensures safe use (75). - Consider Your Taste Preferences
Choosing an herbal tea that aligns with your taste preferences enhances your enjoyment and adherence to a bedtime routine. Floral options like chamomile offer subtle sweetness, while peppermint provides a refreshing flavor (76). Selecting a tea you enjoy ensures consistency in its use for sleep benefits (77). - Look for Organic and High-Quality Products
Selecting organic and high-quality herbal teas ensures safety and effectiveness, as these products are free from harmful pesticides and additives. Organic teas like chamomile or rooibos are particularly beneficial for sleep (78). High-quality ingredients retain higher levels of active compounds, enhancing their therapeutic effects (79). Verifying certifications like USDA Organic helps ensure authenticity (80). - Experiment with Combinations
Combining herbal teas can enhance their sleep-inducing properties by leveraging complementary effects. For instance, valerian and hops work synergistically to promote relaxation (6). Chamomile and lavender provide both calming and aromatic benefits (81). Adding lemon balm to blends can help alleviate restlessness (77). Combining ashwagandha with rooibos offers adaptogenic and antioxidant support (82). Experimenting with these combinations ensures personalized effectiveness.
Tips for Maximizing the Effects of Herbal Teas
In today’s fast-paced world, achieving restful sleep can be challenging. Many individuals turn to natural remedies like herbal teas to enhance sleep quality. Herbal teas such as chamomile, valerian root, lavender, and passionflower are renowned for their calming properties, which may promote relaxation and improve sleep. Incorporating these teas into your nightly routine could serve as a soothing ritual to help you unwind and prepare for a good night’s rest.
- Choose Relaxing Herbal Teas
Opt for teas like chamomile, lavender, or valerian known for their calming properties, which help promote sleep and relaxation. - Set a Consistent Time
Drinking tea at the same time each evening trains your body to associate it with winding down. - Create a Comfortable Setting
Prepare your tea in a calm, decluttered space with dim lighting to enhance its relaxing effects. - Experiment with Blends
Try combinations of herbs like peppermint and lemon balm to find a flavor that suits your taste and enhances relaxation. - Use Loose-Leaf Teas
Loose-leaf teas often provide stronger flavor and higher quality, enriching your nightly experience. - Integrate Mindfulness
Sip your tea slowly, focusing on its warmth, aroma, and taste to integrate mindfulness into your routine. - Pair with Relaxation Techniques
Combine your tea time with light yoga, meditation, or breathing exercises for maximum effect. - Prepare Ahead
Pre-measure your tea and have a kettle ready to streamline the process and ensure consistency - Monitor Effects
Keep track of how different teas affect your sleep and mood to refine your nightly choices.
Conclusion
Herbal teas, with their natural calming and sleep-enhancing properties, offer a gentle and effective remedy for improving sleep quality. From chamomile’s mild sedative effects to valerian root’s role in reducing sleep latency and passionflower’s anxiolytic benefits, these teas have shown promising results in promoting relaxation and addressing sleep disturbances. Lavender, lemon balm, peppermint, and rooibos teas add further diversity to the range of options available, catering to individual preferences and specific needs. By incorporating these teas into a nightly routine, individuals can establish a soothing ritual that not only supports better sleep but also contributes to overall well-being. With modern research validating their traditional uses, herbal teas continue to stand as a holistic and accessible solution for achieving restful sleep in a natural way.
References:
- Mohideen Abdulkader, M., et al. “Herbs for Better Sleep: A Natural Guide to Improving Sleep Quality and Overcoming Insomnia with Herbal Remedies.” PDF link.
- Chang, S.M., & Chen, C.H. “Effects of an intervention with drinking chamomile tea on sleep quality.” Read here.
- Ngan, A., & Conduit, R. “A placebo-controlled investigation of passionflower tea on sleep quality.” Find study.
- Bulman, A., et al. “Lemon balm and its sleep-supportive effects.” Study details.
- Baek, Y., et al. “Three-component herbal tea for prolonged fatigue and improved sleep.” Research.
- Rosu, S., et al. “Nutraceuticals and their impact on sleep disturbances.” Review here.
- Zamora, A.N., et al. “Tea and other diet-related practices in relation to sleep health.” Read here.
- Wei, Y., et al. “Tea active ingredients and sleep.” Access PDF.
- Seehuus, M., et al. “Updates on sleep therapeutics.” Article link.
- Poswal, F.S., et al. “Gut health and herbal teas.” Read PDF.
- Adnan, M., et al. “Exploring herbal combinations for sleep.” Access review.
- Sarrafi-Zadeh, S., et al. “Nutritional modulators of sleep.” Full article.
- Abdullahzadeh, M., et al. “Effect of Oral Chamomile on Sleep Quality in Elderly.” PMC link
- Kazemi, A., et al. “Chamomile and Sleep Quality: Meta-Analysis.” Read here
- Kimura, R., et al. “Narrative Review on Chamomile Benefits.” Study details
- Zick, S.M., et al. “Efficacy of Chamomile for Chronic Insomnia.” Springer link
- Frontiers in Sleep. “Valerian root and its impact on sleep quality.” Read study.
- Nobahar, M., et al. “Effects of valerian on hemodialysis patients’ sleep.” PMC study.
- “Therapeutic applications of valerian tea.” Access here.
- Wiley Library. “Herbal sedatives for insomnia.” View report.
- Hill Publisher. “Analysis of valerian’s efficacy in improving sleep.” PDF download.
- Afshar, M.K., et al. “Lavender essential oil and sleep quality in postpartum women.” NIH study.
- Luo, J., Jiang, W. “Lavender in sleep disorders.” Wiley Online.
- Chen, S.L., Chen, C.H. “Lavender tea for postpartum depression.” Sigma Journals.
- Her, J., Cho, M.K. “Aromatherapy and sleep quality.” Elsevier.
- Hirokawa, K., et al. “Lavender and sleep in Japanese students.” SAGE Journals.
- Seiiedi-Biarag, L., Mirghafourvand, M. “Lavender’s role in maternal sleep.” De Gruyter.
- Bazrafshan, M.R., et al. “Lavender tea’s rapid effects on sleep.” Elsevier.
- Miloa Academy. “Passionflower tea and subjective sleep quality.” PDF study.
- Groves, M. “Herbal remedies for sleep improvement.” NIH study.
- “Natural approaches for optimal sleep with passionflower.” Springer link.
- Zeng, Z., et al. “Mechanisms of Action in Sleep Supplements.” Hill Publisher.
- Sinaei, M., et al. “Aromatherapy with Lemon Balm for Sleep.” Open Public Health Journal.
- Świąder, K., et al. “Therapeutic Properties of Lemon Balm.” Full text.
- James, K. “Calming Effects of Lemon Balm.” Korunutrition.
- Ghazizadeh, J., et al. “Effects of Lemon Balm on Anxiety.” Wiley Online.
- Gutiérrez-Romero, S.A., et al. “Lemon Balm in Sleep Quality Trials.” Nature.
- Gyllenhaal, C., et al. “Safety of Herbal Sedatives.” ScienceDirect.
- Abdelhalim, A. “The Effect of Mentha piperita on Sleep and Stress.” ResearchGate PDF.
- Fox, M., et al. “Peppermint on Mental Performance and Sleep.” Facenaturals PDF.
- Nieman, K. “Peppermint’s Benefits for Relaxation and Sleep.” ScienceDirect.
- Kang, H., et al. “The Role of Peppermint in Improving Sleep.” Integrative Medicine Research.
- Rathod, F. “Stress and Sleep: Peppermint Tea Insights.” Informatics Journals.
- Kazemi, A., et al. “Peppermint in Sleep Supportive Therapies.” Taylor & Francis.
- Lin, P.C. “Meta-Analysis of Peppermint and Sleep Quality.” ScienceDirect.
- Speer, K.E., et al. “The Effect of Rooibos Tea Consumption on Human Health Outcomes.” MDPI.
- Morton, J.F. “Rooibos Tea as a Caffeineless Beverage.” Springer Link.
- Minné, D., et al. “Tea Polyphenols on Emotional Homeostasis and Sleep.” ScienceDirect.
- Joubert, E., et al. “South African Herbal Teas Review.” DEF-SA.
- Sishi, M. “Evaluation of Rooibos for Herbal Tea Product Development.” SunScholar.
- Van Zyl, L.C. “Rooibos Tea Market and Consumer Behavior.” CPUT.
- Smit-van Schalkwyk, M., et al. “Rooibos Tea and Cardiovascular Health.” CVJA.
- Van der Linden, M., et al. “Caffeine Consumption and Sleep Health.” MDPI.
- Langade, D., et al. “Ashwagandha for sleep enhancement.” Read here.
- Wiciński, M., et al. “Ashwagandha’s potential for improving sleep.” MDPI.
- Umesh, A., et al. “Efficacy of Ashwagandha in Insomnia.” LWW.
- Kramer, M.S. “Natural remedies for sleep improvement.” Springer.
- Lopresti, A.L., et al. “Ashwagandha’s role in reducing stress and enhancing sleep.” SAGE.
- D’Cruz, M., et al. “Clinical applications of Ashwagandha.” Taylor & Francis.
- Gomes, J.R.M. “Ashwagandha for stress and sleep health.” ProQuest.
- Benkherouf, A.Y., et al. “Humulone modulation of GABAA receptors and its role in hops sleep-promoting activity.” Frontiers in Neuroscience.
- Ring, M., et al. “Dietary supplements for insomnia.” Current Sleep Medicine Reports.
- Kolobaric, A., et al. “A randomized trial to assess sleep health outcomes with hops tea.” MDPI.
- Cornu, C., et al. “The effects of hops on sleep quality.” Springer.
- Basch, E., et al. “Systematic review of hops’ effects on sleep.” Liebert Pub.
- Panagiotakos, D., et al. “Effects of hops on anxiety and sleep quality.” Springer.
- Reyes, C.M., & Cornelis, M.C. “Caffeine in the Diet and Sleep.” MDPI.
- Niazi, P. “Caffeine-Free Beverages for Sleep Health.” Scientific Research Reports.
- Rodda, S., et al. “Impact of Herbal Teas on Sleep.” ScienceDirect.
- Yang, W. “Consumer Choices for Caffeine-Free Herbal Teas.” CUNI Repository.
- Janowiak, J.J., et al. “Comprehensive Approach to Allergy Management.” Liebert.
- Ziment, I., & Tashkin, D.P. “Alternative Medicine for Allergy and Asthma.” ScienceDirect.
- Yeom, J.W., et al. “Herbal Supplements and Sleep.” PubMed.
- Miller, L.G. “Herbal Medicinals: Drug-Herb Interactions.” JAMA.
- Izzo, A.A., et al. “Herbal and Prescribed Drug Interactions.” Springer.
- Sánchez-Ortuño, M., et al. “Natural Products for Sleep.” ScienceDirect.
- Boon, H., et al. “Taste Preferences in Natural Health Products.” SAGE Journals.
- Sripromma, P. “Product Development of Herbal Tea Bag.” AU Repository.
- Huda, H.S.A., et al. “Modern Global Brews of Herbal Teas.” Wiley Online Library.
- Gill, M. “Speciality and Herbal Teas.” Springer.
- Che, C.T., et al. “Herb-Herb Combination Effects.” MDPI.
- Leach, M.J., et al. “Ashwagandha and Rooibos for Sleep.” ScienceDirect.