If you are a poker player, you can't really schedule your sleep. Sometimes it is because of poker, but frequently it is just because poker is a (relatively) low responsibility gig where you don't have to be awake at any given time (caveat: some things are only open for a few hours during the day-- the post office, doctor's office, etc.). People really only have sleep "schedules" because they have to get up for something or they enjoy a routine. I am not sure if I fit into one of those categories (the first, never; the second, from time to time).
I usually just don't really care what my sleep schedule is. It rarely matters. I travel a lot, I try to adjust it from time to time if I have to be awake for something, but other than that, I sleep when I'm tired. Sick life, eh?
My hours of slumber have been all over the place the last few weeks since I changed time zones a few times. I'm not too worried about it, I usually just book my next flight around it so I can sleep on the plane.
I find myself a little high strung before bed from time to time and am (half-heartedly) looking for a remedy. It's been watching Deadwood lately, but for those of you who know the show, that isn't the best late night formula (although it is better than playing poker**). I keep meaning to do like 15 minutes of reading or something before bed, but it seems like it gets my mind too active. I don't think I'm a warm milk kind of guy either.