Hypersomnia

hypersomnia /hy·per·som·nia/ (-som´ne-ah) excessive sleeping or sleepiness.

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hy·per·som·ni·a (hpr-smn-)

n.

A condition in which one sleeps for an excessively long time but is normal in the waking intervals.

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Hypersomnia

An abnormal increase of 25% or more in time spent sleeping. Patients usually have excessive daytime sleepiness.

Mentioned in: Sleep Disorders

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hypersomnia

pathologically excessive sleep or drowsiness.

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hypersomnia Sleep disorders Excessive or prolonged sleep, which may be associated with difficulty in awakening, staying awake or sleep drunkenness Examples Sleep apnea, narcolepsy, nocturnal myoclonus, obstructive sleep apnea, isolated sleep paralysis, central sleep apnea, idiopathic hypersomnia, respiratory muscle weakness associated sleep disorder. See Narcolepsy, Sleep-apnea syndrome, Sleep disorders. Cf REM sleep.

Hypersomnia types

Primary hypersomnia

• Hypersomnia-bulimia syndrome of Klein-Levine Characterized by semiannual bouts of hyperphagia followed by a 2-5 day 'sleep-off', seen in young ♂

• II. Hypersomnia-sleep apnea syndrome A condition affecting obese and hypertensive middle-aged ♂, which is characterized by daytime grogginess and loud snoring; these Pts are at ↑ risk for AMI and CVAs

Secondary hypersomnia A symptom caused by focal CNS disease, eg brain tumors, especially those of the posterior hypophysis or diencephalon, encephalopathia lethargica and meningitis or systemic disease, eg hypothyroidism, trypanosomiasis