Difficulty sleeping is a very common human condition. The results of epidemiological studies have suggested that nearly 20% of the population suffer from it (Karacan et al., 1983). The word insomnia, literally meaning a habitual inability to sleep, is usually used to define the symptom. We may also say that insomnia is the perception or complaint of inadequate or poor-quality sleep, not but abnormality of objective sleep measures themselves. There are those people who have slept for less than 6 hours per night without any perceptions or complaints of poor sleep, while there are those patients who complain of habitual difficulty sleeping although their polygraphic features are normal.
KeywordsSleep Disorder Pittsburgh Sleep Quality Index Primary Insomnia Bright Light Exposure Specific Sleep Disorder
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