Interesting observation. Although, if you go purely with that guideline, you'll find yourself out-of-sync with day and night pretty quickly. You'd need an addi

Interesting observation. Although, if you go purely with that guideline, you'll find yourself out-of-sync with day and night pretty quickly. You'd need an additional constraint to make sure that the duration of a sleep/wake cycle adds up to 24h, on average. Some soft constraint such as "try to go to bed at a sensible time" will probably do it though.