Sometimes, when I’m laying in bed, trying to sleep, I feel like I’m falling. Obviously, I jolt in order to save myself, only to find I wasn’t falling at all and was still laying in bed safely. Why does that happen?
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It’s called a myoclonic jerk. They’re very common but not entirely understood. The best explanation I came across was that when you lay down, your blood pressure drops precipitously (too fast). Your brain senses this sudden drop and gets worried that you might have an injury or are otherwise in danger, so it releases the emergency brake on your adrenal system and dumps chemicals that raise your heart rate, bringing your pressure back up to normal.
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