Idiopathic Hypersomnia (ICSD-3) or Hypersomnolence Disorder (DSM-5), is a broad diagnosis and includes symptoms of excessive quantity of sleep, deteriorated quality of wakefulness, and sleep inertia. Individuals with this disorder fall asleep quickly and have a high sleep efficiency (>90%). They may have difficulty waking up in the morning, sometimes appearing confused, combative, or ataxic. This prolonged impairment of alertness during the sleep-wake transition is often referred to as sleep inertia (or sleep drunkenness).
Approximately 5%-10% of individuals who consult in sleep disorders clinics with complaints of daytime sleepiness are diagnosed as having hypersomnolence disorder. It is estimated that about 1% of the European and U.S. general population has episodes of sleep inertia. Hypersomnolence occurs with relatively equal frequency in males and females.
Self-reported excessive sleepiness (hypersomnolence) despite a main sleep period lasting at least 7
hours, with at least 1
of the following symptoms:
9
hours per day that is nonrestorative (i.e., unrefreshing).
The hypersomnolence occurs at least 3
times per week, for at least 3
months.
The hypersomnolence is accompanied by significant distress or impairment in cognitive, social, occupational, or other important areas of functioning.
The hypersomnolence is not better explained by and does not occur exclusively during the course of another sleep disorder (e.g., narcolepsy, breathing-related sleep disorder, circadian rhythm sleep-wake disorder, or a parasomnia).
The hypersomnolence is not attributable to the physiological effects of a substance (e.g., a drug of abuse, a medication).
Specify if:
Specify if:
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Specify severity based on degree of difficulty maintaining daytime alertness as manifested by the occurrence of multiple attacks of irresistible sleepiness within any given day occur ring, for example, while sedentary, driving, visiting with friends, or working.
Nocturnal polysomnography will show: