Like most everything else, sleep is best done in moderation. Spending too many hours in bed each night can cause as many problems as getting too few hours of sack time, according to a University of California, San Diego study in the journal Psychosomatic Medicine. The study found people who sleep more than eight hours a night (long sleepers) and people who get less than seven hours of slumber both report more sleep complaints than people who get just the right amount of shuteye -- between seven and eight hours per night. HealthDay