When Does Sleep Paralysis Usually Occur?
Sleep paralysis usually occurs at one of two times. If it occurs while you are falling asleep, it's called hypnagogic or predormital sleep paralysis. If it happens as you are waking up, it's called hypnopompic or postdormital sleep paralysis.
Hypnagogic Sleep Paralysis
As you fall asleep, your body slowly relaxes. Usually you become less aware, so you do not notice the change. However, if you remain or become aware while falling asleep, you may notice that you cannot move or speak.
Hypnopompic Sleep Paralysis
During sleep, your body alternates between REM (rapid eye movement) and NREM (non-rapid eye movement) sleep. One cycle of REM and NREM sleep lasts about 90 minutes. NREM sleep occurs first and takes up to 75% of your overall sleep time. During NREM sleep, your body relaxes and restores itself. At the end of NREM, your sleep shifts to REM. Your eyes move quickly and dreams occur, but the rest of your body remains very relaxed. Your muscles are "turned off" during REM sleep. If you become aware before the REM cycle has finished, you may notice that you cannot move or speak.
Who Develops Sleep Paralysis?
Up to 4 out of every 10 people may have sleep paralysis.This condition may occur in those who are otherwise healthy or those with narcolepsy, or it may run in families as a result of specific genetic change. This condition can be triggered by sleep depriation, psychological stress, or abnormal sleep cycles.
- Narcolepsy
- Sleep apnea
- Irregular sleep Schedules
- Post-traumatic stress disorder
- Genetic factor
patterns and medical history. They may also ask you to keep a sleep diary, documenting your experience during sleeping paralysis episodes.











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