What is insomnia?
Insomnia is defined as difficulty initiating or maintaining sleep, or both, despite adequate opportunity and time to sleep, leading to impaired daytime functioning. Insomnia may be a cause of or result of poor quality and/or quantity of sleep.
Insomnia is very common. Ninety percent of the general population has experienced acute insomnia at least once. Approximately 10% of the population may suffer from chronic (long-standing) insomnia.
The problem affects people of all ages including children, although it is more common in adults and its frequency increases with age. In general, women are affected more frequently than men.