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At least three types of insomnia exist: transient, acute, and chronic.
- Transient insomnia lasts from days to weeks. It can be caused by another disorder, by changes in the sleep environment, by the timing of sleep, or by stress. Its consequences - sleepiness and impaired psychomotor performance - are similar to those of sleep deprivation.[5] If this form of insomnia continues to occur from time to time, the insomnia is classified as intermittent.[citation needed]
- Acute insomnia is the inability to consistently sleep well for a period of between three weeks to six months.[citation needed]
- Chronic insomnia lasts from months to years. It can be caused by another disorder, or it can be a primary disorder. Its effects can vary according to its causes. They might include sleepiness, muscular fatigue, and/or mental fatigue; but people with chronic insomnia often show increased alertness.[5]