Insomnia Overview

Insomnia is a common health problem. It can cause excessive daytime sleepiness and a lack of energy. Long-term insomnia can cause you to feel depressed or irritable; have trouble paying attention, learning, and remembering; and not do your best on the job or at school. Insomnia also can limit the energy you have to spend with friends or family.

Insomnia can be mild to severe depending on how often it occurs and for how long. Chronic insomnia means having symptoms at least 3 nights per week for more than a month. Insomnia that lasts for less time is known as short-term or acute insomnia.