Mind is an abstract concept with no absolute definition. But to answer your question with a physiological pov, your brains is going into maintenance and update mode. It sorts and process informations gathered and created during waking hours, keeps what it deems worthy to keep and discard the unnecessary. There’s other things happening but that’s one of the basic things that is happen to your brain. Also during sleep your brain switch to different state of mind and I think the only moments you can volunteerly wake up is when you dream.
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