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
We’re not unconscious, like knocked out.
Sleeping is in the subconscious, where our brains are still working away, and aware of our surroundings (hence being about to be woken by noises, etc.)
Only part of our brain is “on hold” when we sleep
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