I’ve never actually slept. I lay still in bed, until I find myself waking up. Time has passed, but I have no idea what happened during the time in between laying down and waking up. I only feel the effects of having slept. Similarly there is a version of me that has only ever slept, and knows nothing of the awakened life. Yet still I wonder, if there is even a third version unknown to both of us?
Unbeknownst to you, what actually happens is that as soon as you fall asleep the universe is disassembled and then immediately re-assembled a few hours in the future.