A study has discovered the personality trait that keeps people awake at night: It’s expecting too much of yourself. Insomniacs set much higher expectations for themselves than other people do. As a result, they’re too stressed out to sleep! That’s according to the journal Behavioral Sleep Medicine. If that describes you, jot down 3 things you accomplished during the day – or that you felt good about. That’ll help clear your mind so you can fall asleep faster.