It happens to me pretty often, especially when I'm stressed about work. It's like I lose my balance out of nowhere and fall into a void, and right before I hit the ground I wake up with my heart pounding. Is there something in the brain that causes this?
That falling sensation is one of those weird sleep things that pretty much everyone experiences at some point, especially when things are going badly in everyday life. What happens is your brain gets caught between sleeping and being awake, and in that moment your muscles relax but your mind stays partially active processing stress and insecurity, so your body interprets that relaxation as if you were actually losing your balance. Your heart races because your nervous system genuinely gets scared, even though physically you're safe in bed. The most effective thing I've seen is that people manage to reduce these when they lower their everyday stress, so if you can disconnect a bit before bed it'll probably get better.
What's happening to you is a reflex of your nervous system - basically, your brain is in that state between wakefulness and deep sleep where your muscles relax but your mind is still partially active. Those falling dreams, called hypnagogic dreams, are super common when you're stressed or sleeping poorly because your body interprets that muscle relaxation as a loss of balance and triggers that panic sensation. Your heart races because at that moment your autonomic nervous system is confused, activating an alert response. If it happens to you a lot when you're dealing with work stress, the best thing is to try to wind down before bed: less coffee, some exercise during the day (which helps with sleep quality), and try to sleep on a regular schedule.
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