Interesting thread. I have done this many times now - go to bed early, get up around midnight for observing session, work or whatever, then back to bed between 3am and 4am, to wake well-rested 3 to 4 hours later. It does work. Somewhere I've read that 7 or 8 hours per day is about right for most. Those hours can be had in whatever portions you like, as long as one of them is 4 hours or more.
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