what is sleep insomnia?
Insomnia (say: in-sohm-nee-uh) is a sleep disorder. People who have insomnia may not be able to fall asleep. They may wake up during the night and not be able to fall back asleep, or they may wake up too early in the morning. Many people have insomnia. Chronic insomnia is when your sleeping problem lasts for 4 weeks or longer.