What is the cure for insomnia?

Many answers: Insomnia when severe is rarely cured. Some sleep disorders such as sleep apnea can be treated with breathing apparatus that significantly improve sleep quality and perhaps might be considered a "cure." some forms of insomnia are "cured." when their underlying disease is treated, successfully such as severe depression. A very complex question to answer, indeed.

Depends: Depends on if the insomnia is due to stress, psychiatric disorder, a primary sleep disorder, another medical condition, medications or poor sleep hygiene. The best treatment is addressing the reasons for the insomnia. Chronic insomnia is best treated with a behavioral program called cbt. Medications are usually indicated for short term use.