7. People who don’t sleep enough are more likely to develop diabetes — even if they are skinny.
Type 2 diabetes is an awful disease that can lead to strokes, amputations, blindness, and organ damage. And this isn’t just about obesity, so if you are skinny but don’t get enough sleep this still applies.
Otherwise healthy adults lose their ability to control blood sugar without getting enough sleep, and the less sleep someone gets, the more likely they are to develop a problem. Compared to adults who sleep seven to eight hours a night, people who sleep six hours are 1.7 times as likely to develop diabetes, and people who sleep five hours are 2.5 times as likely to develop diabetes.
8. People who sleep enough have better moods and fewer problems with depression and anxiety.
People who sleep less tend to have more symptoms of depression, lower self esteem, and more anxiety — though that’s an association and it’s possible that those symptoms cause people to sleep less.
Still, a review of studies shows that sleep loss has an even stronger effect on mood than it does on cognitive ability or motor function, which is a strong indicator that sleeping more could help.