When you’re in REM sleep your brain basically paralyses your muscles preventing movement.
Sometimes your brain will wake up some parts of your body but not your muscles, which leads to you waking up but not being able to move, this is sleep paralysis, if your mind is still “dreaming” while this occurs then you may hallucinate and see things.
Also, the process of falling asleep is similar to the feeling of dying, so sometimes when you’re just about to fall asleep you jolt back awake and your muscles spasm, this is because your brain thinks “oh shit, they’re dying, quick try and stop it!” Instead of the usual ” *yawn* time for sleep”
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