The document discusses sleep, insomnia, and their treatment. It defines insomnia as difficulty initiating or maintaining sleep. Insomnia can be transient, acute, or chronic. Common causes include medical, psychiatric, substance-related, and circadian issues. Treatment involves addressing underlying causes, improving sleep hygiene, cognitive-behavioral therapy including stimulus control and sleep restriction, and may include pharmacotherapy with hypnotics as a short-term option. Multicomponent cognitive behavioral therapy is most effective for insomnia.