The second thing to say is that, as is a common refrain in this book, sleep is a key issue.15 Drops in marital satisfaction are higher in couples with kids who sleep less. Lack of parental sleep contributes to depression (in both parents) and correspondingly to less-happy marriages. You need sleep to function, and sleep deprivation affects your mood. If you are cranky, you’re cranky with your partner. If they are also tired, they are also cranky. Cranky, cranky, sad, angry.
