Insomnia is a symptom of any of several sleep disorders, characterized by persistent difficulty falling asleep or staying asleep despite the opportunity.
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Types of insomnia
Although there are several different degrees of insomnia, three types of insomnia have been clearly identified: 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, severe depression, or by stress. Its consequences - sleepiness and impaired psychomotor performance - are similar to those of sleep deprivation.
2-Acute insomnia is the inability to consistently sleep well for a period of between three weeks to six months.
3- Chronic insomnia lasts for years at a time. 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, hallucinations, and/or mental fatigue; but people with chronic insomnia often show increased alertness. Some people that live with this disorder see things as though they were happening in slow motion, wherein moving objects seem to blend together. Can cause double vision.
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