If you're regularly snoozing nine hours or more per night, you may be putting yourself at risk for more than a few illnesses, including diabetes and heart disease. Cognitively, you're not at the top of your game, either. According to a 2014 report from the Harvard-based Nurses' Health Study
, women who slept nine hours or more performed worse on cognitive and memory tests than women who averaged seven hours of sleep nightly. Lead researcher Elizabeth Devore suspects that the brains of those who slept longer were aging faster because those women were disrupting their body's natural circadian rhythm. Her advice: "Don't kick this problem down the road. As early as midlife, sleep habits can predict future memory problems. Create a routine: Go to bed at the same time every night and force yourself to get up at an appropriate time, even if you're still a little tired."
Why hitting the snooze button can screw up your entire day