That certainly seems to be the story with me -- not drugs, per se, but general greediness and over-stimulation puts me on a ~24.5 hour cycle. When the mind is m

That certainly seems to be the story with me -- not drugs, per se, but general greediness and over-stimulation puts me on a ~24.5 hour cycle. When the mind is making a lot of noise it's harder to get to sleep and it takes more sleep to recover. That said, I suspect there's no fundamental reason why a night owl can't become a morning lark if he sincerely wants to.