It may seem that throwing back extra drinks would help folks fall asleep faster and sleep better overall. But that may not be true for those having more than four drinks at a time.

There is no doubt that drinking a lot of alcohol can make a person sleepy or pass out. But alcohol can affect how a person sleeps in more complex ways as well.

Pregnancy is notorious for causing women difficulty with sleeping — though not as notorious as the months after the baby arrives. Having an eating disorder can worsen the problem.