From ye olde "Natural Hygiene" health info, I heard that:
The more hours of sleep BEFORE midnight, the better.
So "hit the hay" as early as possible, 8-9-10pm.
I can't remember the associated specific reason for that statement, but compare that with the alleged three 8-hour body cycles in a 24-hour period:
__Noon - 8pm: "Appropriation": All eating (intake) should be done during this cycle.
__8pm - 4am: "Assimilation": During this cycle the body is taking all the nutrients from the food during the prior cycle & assimilating it into the cells & body systems.
__4am - Noon: Elimination cycle (detox) during which the body is filtering out & unloading metabolic & cellular waste & toxins via the liver, skin, lungs/breath, eyes, ears, bladder, bowels, etc.
--Have read from various non-Natural Hygiene sources that 3am is allegedly the time of night the liver kicks-in to begin its deepest-cleaning. To be in a good deep sleep during that time would seem very beneficial.
--No intake/food should be taken until Noon, or it will interrupt/stop the Detox cycle & the body has to switch to Digestion mode.
--But if you must eat before Noon, word is to let it be high-water-content juicy-fruits, the easiest food for the body to Digest.
One article here re the cycles but there are many others (& probably just as many more that say Natural Hygiene is all bunk, etc.):