Abstract
The classification of sleep disorders has been of particular interest to clinicians ever since they were initially recognized. The International Classification of Sleep Disorders, 2nd edn (ICSD-2) classification lists 85 sleep disorders, each presented in detail and with a descriptive diagnostic text that includes specific diagnostic criteria. The ICSD-2 has eight major categories: (1) the insomnias; (2) the sleep-related breathing disorders; (3) the hypersomnias not due to a sleep-related breathing disorder; (4) the circadian rhythm sleep disorders; (5) the parasomnias; (6) the sleep-related movement disorders; (7) other sleep disorders; and (8) isolated symptoms, apparently normal variants, and unresolved issues (Table 1.1).
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