Referring to the semiconscious state immediately preceding sleep; may include hallucinations that are of no pathological significance.
Hypnagogia refers to the phase that bridges wakefulness and sleep. During this stage, vivid mental images, known as hypnagogic images, can occur right before falling asleep. In some cases, such as in the sleep disorder narcolepsy, these hypnagogic hallucinations can be distressing.