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)
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Scientists recently discovered an enzyme pathway involved in waking. SIDS (Sudden Infant Death Syndrome) is caused by a genetic defect where babies don’t have enough of that enzyme.
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