Diagnosis of Insomnia
The prevalence of insomnia is very high. Recent epidemiological surveys indicate that the prevalence rate of insomnia in the United States is 35.2%. Insomnia occurs widely, affecting healthy individuals, men or women, elderly or young people, urban or rural residents alike. Insomnia also occurs in various mental, neurological, and internal medical conditions.
The subjective criteria (clinical standards) for insomnia are:
(1) Subjective complaints of sleep dysfunction;
(2) Daytime fatigue, head fullness, dizziness, etc., caused by sleep disturbance;
(3) Simply reduced sleep duration without daytime discomfort (short sleepers) should not be considered as insomnia.
The objective criteria for insomnia are based on polysomnography results:
(1) Prolonged sleep latency (over 30 minutes);
(2) Reduced actual sleep time (less than 6.5 hours per night) and increased wakefulness time (over 30 minutes per night).
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