A Weakened Immune System
We all hang around in bed during our bouts of illness. But did you know that skipping out on the bed rest can increase your risk of getting sick? Prolonged sleep deprivation has long been associated with diminished immune functions, but researchers have also found a direct correlation between "modest" sleep deprivation -- less than six hours -- and reduced immune response.
Try to toughen up your immune system by getting at least seven hours of sleep a night, and maintaining a healthy diet. You'll be glad you got that extra hour of sleep the next time that bug comes around and leaves everyone else bedridden with a fever for three days.