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At least three types of insomnia exist: transient, acute, and chronic.

1. 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]}
2. Acute insomnia is the inability to consistently sleep well for a period of between three weeks to six months.^{[citation needed]}
3. 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]