Insomnia, or sleeplessness, is a sleep disorder in which there is an inability to fall asleep or to stay asleep as long as desired (Wikipedia).
Insomnia is most often thought of as both a medical sign and a symptom that can accompany several sleep, medical, and psychiatric disorders characterized by a persistent difficulty falling asleep and/or staying asleep or sleep of poor quality. Insomnia is typically followed by functional impairment while awake. Insomnia can occur at any age, but it is particularly common in the elderly. Insomnia can be short term (up to three weeks) or long term (above 3–4 weeks); it can lead to memory problems, depression, irritability and an increased risk of heart disease and automobile related accidents. (Wikipedia)
The DSM-5 criteria for insomnia include the following:
Predominant complaint of dissatisfaction with sleep quantity or quality, associated with one (or more) of the following symptoms:
Types of insomnia:
It is important to identify or rule out medical and psychological causes before deciding on the treatment for insomnia.