Days are imaginary. They're man-made constructs used to delineate time, just as hours, minutes, and seconds are. Without humans there would be no days.
Discussion
👍 there is a time when you wake up and that’s a start of something
It's totally subjective. From your perspective, it's the start of a new day but it just exists in your mind. I'm reality, the closest thing to a day is the sun cycle that from our perspective looks like the sun rising in the east in the morning (another man-made construct), and setting in the west in the evening. But even that doesn't really exist because the sun doesn't actually rise and set. it just looks that way, again from our perspective, when in fact it's just how we perceive the perpetual rotation of the earth.
Yeah but subjective from my perspective is what I care about.
I guess if you watch a person sleep, they wake up in the same “space”. But, is it them - the person who fell asleep (their energy - whatever that is), or did it go elsewhere?
Where would they have gone? They're right there.
That assumes one continuous consciousness is bound to the body.
True, but when I wake up in the morning I remember before I fell asleep, and I remember my dreams. There are obviously periods of my sleep when I don't have any memories, but before and after those periods I seem to have a consistent sense of self. If there was some other consciousness, I don't when it would be active.
Maybe your brain reconstructs your identity when you wake up but your other consciousness is gone elsewhere. You feel continuous because the brain loaded the data it stored of you from long term memory (think hard drive) but the new instance of you is not in any shape related to the one that was there before you fell asleep.
there is a circadian rhythm
people poop at the same time every day
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I'd rather call it "cycles", since every measure of "time" is with the planetary revolution around the sun. And a "day" is just a word to mean a completed cycle of that revolution.