If sleep means the disappearance of consciousness, shouldn’t sleeping be basically like blinking, and then the next thing we know it’s eight hours later?
But in reality, we can tell some time has passed. And me, personally at least, I can usually estimate how long I’ve been asleep with some accuracy.
In: Biology
I bet if you went to sleep in a pitch dark box with no indications of the outside world and woke up, you wouldn’t be able to tell for how long you’ve slept
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