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What is Insomnia? If you can't sleep, you may be wondering if you have insomnia. Insomnia is a complicated condition. What is the definition of insomnia? According to guidelines from a physician group, insomnia is difficulty falling asleep or staying asleep, even when a person has the chance to do so.
Insomnia can be grouped into primary and secondary, or comorbid, insomnia. Primary insomnia is a sleep disorder not attributable to a medical, psychiatric, or environmental cause. It is described as a complaint of prolonged sleep onset latency, disturbance of sleep maintenance, or the experience of non-refreshing sleep.nsomnia can be classified as transient, acute, or chronic. 1  Transient insomnia lasts for less than a week. 2  It can be caused by another disorder, by changes in the sleep environment, by the timing of sleep, severe depression, or by stress.