Most people have some nights when they cannot sleep. About one in three American s has a problem with sleep. Many of these people cannot fall asleep. The name of this problem is insomnia. The word insomnia means "no sleep." Some people say ,"I didn't sleep all night."But that's no really true. They may sleep lightly and week up several times. In the morning, they only remember the times they were awake, so they think they were awake all night