Insomnia occurs when people have trouble sleeping. It may involve difficulty falling asleep, staying asleep, or waking too early. Due to the lack of sleep at night, people often experience fatigue and low energy during the day. Some may feel irritable and depressed as chronic fatigue continues. Insomnia can directly affect learning and ability to concentrate. It may be short term or last much longer. It can have a significant impact on school performance, job performance, driving safety, and relationships.

Cognitive behavioral therapy (CBT) is considered the gold standard of treatment for insomnia, more than any medication. CBT for insomnia is short and has been shown to result in lasting improvements.