Sleep paralysis happens when the “sleep” part of your brain and the “wake” part get out of sync, so you wake up mentally while your body is still in REM- sleep paralysis mode, leaving you aware but unable to move. This glitch is more likely when your sleep is irregular, you are very stressed, or you have certain sleep or mental health conditions.

What sleep paralysis is

  • Sleep paralysis is a brief period (seconds to a few minutes) where you are awake but cannot move or speak, usually as you are falling asleep or waking up.
  • It often comes with vivid hallucinations (like sensing a presence, pressure on the chest, or strange shapes), which is why people talk about “sleep paralysis demons.”

What’s going on in the brain

  • During REM sleep, your brain switches on muscle atonia (paralysis) so you do not physically act out your dreams.
  • In sleep paralysis, consciousness turns on but REM paralysis and dream-like imagery “spill over” into wakefulness, so you feel awake in a frozen, dream-mixed state.

Why we get sleep paralysis

Common factors that make sleep paralysis more likely include:

  • Irregular or disrupted sleep (shift work, jet lag, staying up very late)
  • Insomnia or chronic sleep deprivation
  • Stress, anxiety, PTSD, and other mental health conditions
  • Sleep disorders like narcolepsy or obstructive sleep apnea
  • Substance use (alcohol or certain drugs) and some medications
  • A family tendency or genetic vulnerability

Sleep paralysis can also occur in otherwise healthy people with no clear trigger, especially in their teens and 20s.

Is it dangerous?

  • Sleep paralysis is usually harmless medically, though it can feel extremely frightening in the moment.
  • It becomes more of a concern if episodes are very frequent, cause intense distress or insomnia, or come with other symptoms such as sudden sleep attacks in the daytime (which can suggest narcolepsy).

How to reduce episodes

You cannot guarantee it never happens, but you can lower the chances:

  • Keep a regular sleep schedule and get enough sleep each night
  • Avoid all-nighters, heavy late-night meals, and too much caffeine or alcohol
  • Try not to sleep strictly flat on your back if that seems to trigger episodes
  • Manage stress (relaxation exercises, therapy, or counseling if needed)
  • Talk to a doctor or sleep specialist if episodes are frequent, very disturbing, or linked with loud snoring, gasping, or sudden daytime sleep attacks

TL;DR: We get sleep paralysis because the brain briefly mixes REM dream- paralysis with waking consciousness, most often when sleep is disturbed, stress is high, or there is an underlying sleep or mental health condition.

Information gathered from public forums or data available on the internet and portrayed here.