Sleep
Disorders
Sleep
disorders can be divided into four major categories: 1) insomnias, disorders
associated with complaints of insuf-ficient, disturbed, or nonrestorative
sleep; 2) hypersomnias, disorders of excessive sleepiness; 3) disturbances of
the cir-cadian sleep–wake cycle; and 4) parasomnias, abnormal be-haviors or
abnormal physiological events in sleep (American Psychiatric Association,
1994). By definition, the Diagnostic and Statistical Manual of Mental Disorders,
Fourth Edition (DSM-IV) limits itself
to chronic disorders (at least 1 month in duration). On the other hand, the International Classifica-tion of Sleep
Disorders includes sleep disorders of short-term and intermediate duration, which in fact are more common than
chronic disorders (Diagnostic Classification Steering Committee Therapy MJC,
1990).
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