You can wake up naturally or be forced to wake up by e.g. loud noise, pain, water.
How does it work?
Bonus question: Why is it possible to cut your blood supply to your arm and not be woken up for hours? (I slept on my arm for 6 hours, felt no arm after waking up)
In: 31
A part of your brain is always active even while you’re sleeping. That part can monitor for natural dangers, which a loud noise, pain, water would all be perceived as, and wake you up.
edit: for your bonus question, you’re not cutting off the blood supply to your arm when you sleep on it, you’re squeezing a nerve, but I’m not sure of the details so maybe someone else can take over that one!
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