What is insomnia?

Insomnia is difficulty falling or staying asleep, which results in significant daytime sequelae (eg fatigue, irritability, impaired concentration and memory) and distress.

People with insomnia are more likely to be involved in accidents. People with chronic insomnia (ie those with established sleep problems) take more sick leave and are at higher risk of medical conditions (eg cardiovascular disease, diabetes), psychiatric disorders (eg depression, anxiety) and premature death.