DYSSOMNIA
\dɪsˈɒmni͡ə], \dɪsˈɒmniə], \d_ɪ_s_ˈɒ_m_n_iə]\
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A broad category of sleep disorders characterized by either hypersomnolence or insomnia. The three major subcategories include intrinsic (i.e., arising from within the body) (SLEEP DISORDERS, INTRINSIC), extrinsic (secondary to environmental conditions or various pathologic conditions), and disturbances of circadian rhythm. (From Thorpy, Sleep Disorders Medicine, 1994, p187)
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