Insomnia is difficulty getting to sleep or staying asleep, or having nonrefreshing sleep for at least 1 month.
Psychophysiological insomnia; Learned insomnia; Chronic insomnia; Primary insomnia
Primary insomnia refers to insomnia that is not caused by any known physical or mental condition.
Insomnia is caused by many different things. The most common causes of insomnia are:
Secondary insomnia is caused by a...Read more