not entirely randomly, but processing stuff that's been "on your mind" and not packed away in long-term memory.
I imagine it (non-scientifically) as the brain's trash compactor, finishing up all the half-completed thoughts of your day, not necessary in any sort of logical way, like mashing the pieces of a jigsaw puzzle together regardless of how well they fit, to get something that just barely fits together at a glance.
I imagine it (non-scientifically) as the brain's trash compactor, finishing up all the half-completed thoughts of your day, not necessary in any sort of logical way, like mashing the pieces of a jigsaw puzzle together regardless of how well they fit, to get something that just barely fits together at a glance.