This concept has always baffled me.
Any help understanding this would be greatly appreciated!
In: Biology
Because there isn’t one.
Sleep isn’t a binary process, rather there are different levels. You ever get woken up just as you were starting to fall asleep, and realise you kind of were already asleep? That’s because you were just in a very light form of sleep where it’s hard to distinguish between being asleep and being awake.
It’s kind of like how you can’t tell an exact moment between not feeling hungry, and feeling hungry.
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