10 Reasons You're Healthier Than You Think

4. You never sleep for eight hours.

Rest easy: Research shows that seven hours is actually best for your health. According to a 2002 study, women and men who slept about seven hours a night had the lowest mortality rates. "The average woman sleeps about six and a half to seven hours, which is close to the ideal," says study author Daniel Kripke, MD, a professor of psychiatry at the University of California at San Diego. "We found at least a 15 percent increased risk of dying among women who slept more than eight hours or less than four." (Researchers theorize that these women may be prone to conditions such as depression or sleep apnea.) The bottom line? "If you're getting six or seven hours a night and feeling energized and alert, you've got nothing to worry about," says Dr. Kripke.

Top That: Schedule a.m. workouts. Women who exercised for more than 30 minutes each morning were 60 percent less likely to have sleep problems than on days when they didn't work out, according to a study done at the Fred Hutchinson Cancer Research Center in Seattle.