Brian Skiff wrote: >There could well be other effects of funny sleep cycles and so on, >but that seems to vary greatly amongst individuals, from little effect >to greatly debilitating physio/psychological problems (that would probably >be there even without staying up late). There are billions of people worldwide who suffer inconsistent or interrupted sleep cycles. They are called "new parents." ;o) I'm not aware of any research indicating that parents are less healthy or more prone to cancer than the rest of society. In any event, these folks would look at the sleep patterns of amateur astronomers with a large dollop of envy. I know I did :o) Regards, Bill in Flagstaff -- See message header for info on list archives or unsubscribing, and please send personal replies to the author, not the list.