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Hypnagogia is the transitional state from wakefulness to sleep, also defined as the waning state of consciousness during the onset of sleep. (Its corresponding state is hypnopompia –sleep to wakefulness.)
Hypnopompia (also known as hypnopompic state) is the state of consciousness leading out of sleep, a term coined by the psychical researcher Frederic Myers.Its mirror is the hypnagogic state at sleep onset; though often conflated, the two states are not identical and have a different phenomenological character.
A hypnic jerk, hypnagogic jerk, sleep start, sleep twitch, myoclonic jerk, or night start is a brief and sudden involuntary contraction of the muscles of the body which occurs when a person is beginning to fall asleep, often causing the person to jump and awaken suddenly for a moment.
Sleep onset is the transition from wakefulness into sleep. Sleep onset usually transits into non-rapid eye movement sleep (NREM sleep) but under certain circumstances (e.g. narcolepsy) it is possible to transit from wakefulness directly into rapid eye movement sleep (REM sleep).
According to studies, [2] [21] [22] they are shift work, hypnagogic hallucinations (also known as hypnagogia), excessive daytime sleepiness, insomnia and hypersomnia disorder, circadian rhythm sleep disorder, restless legs syndrome, obstructive sleep apnea syndrome (OSAS), bipolar disorder, daily smoking, and age of 15–24 years. These risk ...
Klüver's four form constants. In 1926, Heinrich Klüver systematically studied the effects of mescaline on the subjective experiences of its users. In addition to producing hallucinations characterized by bright, "highly saturated" colors and vivid imagery, Klüver noticed that mescaline produced recurring geometric patterns in different users.
Also, to say sleep paralysis and hypnagogia are alike but hypnagogia has nothing to do with REM sleep also reveals your ignorance. A quote from the same article gives references from within that article which you could also look up: " Sleep paralysis and hypnagogic ⁄ hypnopompic hallucinations can be related to specific physiological ...
A false awakening may occur following a dream or following a lucid dream (one in which the dreamer has been aware of dreaming). Particularly, if the false awakening follows a lucid dream, the false awakening may turn into a "pre-lucid dream", [2] that is, one in which the dreamer may start to wonder if they are really awake and may or may not come to the correct conclusion.