Very interesting. Some of the ones that apply to me include the short nap phenomenon. i call it a "reset" and as little as five minutes has worked. Also there is the fact that morning meds spacing is more critical than later in the day.
So what happens in those instances? And are they related? I suspect some sort of restoration of timing to neural circuits in the first case. In the other, perhaps a tie to the daily hormonal cycles as the day advances.
Sleep is a recurring factor for us. (Now there's a darned brilliant statement for you
)