The term insomnia indicates the difficulty falling asleep, of not being able to sleep or inability to remain asleep for sufficiently long times to be able to rest. We can talk about insomnia only in cases where the lack of sleep causes real physical or mental problems to the person, but not when a person sleeps little and still feels rested and happy. Some people in fact have a minimal need for sleep: a few hours are enough to make them rest, and this is because not everyone has the same physical needs. Insomnia in any case, is a disorder, a symptom that shows the presence of an impairment or other problem in the body.
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