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When I was adapted to uberman, I would become sleepy right before it was time for my next nap. Consistently.
I don't know if it's 'ultradian rhythms' as they call it, or just that built in timer in one's head. But it seems to be adaptable, IMO.[/b]
I also lean towards thinking it's conditioned - already I am feeling very sleepy right before my naps every 6 hours, I know if I was entraining uberman that after 6 hours I would be a zombie and would have been fighting off sleep for 2 hours.