Being Overtired Really Can Make You Sick

Evidence is mounting that not clocking enough Zs really can make you more likely to catch a cold. A new study found that people who sleep five hours or less each night were 17 percent more likely to catch a cold and 51 percent more likely to get an infection (like the flu or pneumonia) as people who sleep seven hours or more....
http://www.huffingtonpost.com/entry/overtired-sick_us_570d6c5ce4b03d8b7b9eb30b