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嗜睡症（Hypersomnia）是一种会睡眠过度的疾病，主要有两种类型：原发性嗜睡症和反复性嗜睡症。两者的症状相同，但发生频率不同。
In the 5th edition of the Diagnostic and Statistical Manual of Mental Disorders, published in May 2013, hypersomnia appears under sleep-wake disorders as hypersomnolence, of which there are several subtypes.
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