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
Cats. They are meat, grain and vegetable powered machines that wake you up when they require more fuel. Usually 2 hours too early but atleast they are consistent.
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