Insomnia is defined by a persistent inability to fall asleep, difficulty staying asleep, poor quality of sleep or the inability to go back to sleep. It can be short term lasting up to three weeks or long term lasting more than three weeks. It can also come and go, with periods of time when a person has no sleep problems.
Insomnia is often followed by functional impairment while awake which can include:
- Memory problems
- Poor concentration
- Automobile related accidents