A condition in which sleep periods are excessively long, but the person responds normally in the intervals; distinguished from somnolence. [hyper- + L. somnus, sleep]

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hy·per·som·nia -'säm-nē-ə n
1) sleep of excessive depth or duration
2) the condition of sleeping for excessive periods at intervals with intervening periods of normal duration of sleeping and waking compare NARCOLEPSY

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sleep lasting for exceptionally long periods, as occurs in some cases of brain inflammation.

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hy·per·som·nia (hi″pər-somґne-ə) [hyper- + somn- + -ia] excessive sleeping or sleepiness, as in any of a group of sleep disorders with a variety of physical and psychogenic causes.

Medical dictionary. 2011.

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Look at other dictionaries:

  • Hypersomnia — Infobox Disease Name = PAGENAME Caption = DiseasesDB = ICD10 = ICD10|F|51|1|f|50, ICD10|G|47|1|g|40 ICD9 = ICD9|291.82, ICD9|292.85, ICD9|307.43 ICD9|307.44, ICD9|327.1, ICD9|780.53 ICD9|780.54 ICDO = OMIM = MedlinePlus = eMedicineSubj = med… …   Wikipedia

  • hypersomnia — hypersomniac, n. /huy peuhr som nee euh/, n. Pathol. a tendency to sleep excessively. [1875 80; HYPER + (IN)SOMNIA] * * * …   Universalium

  • hypersomnia — noun Excessive sleepiness …   Wiktionary

  • hypersomnia — n. condition characterized by abnormally long periods of sleep …   English contemporary dictionary

  • hypersomnia — hy·per·som·nia …   English syllables

  • hypersomnia — n. sleep lasting for exceptionally long periods, as occurs in some cases of brain inflammation …   The new mediacal dictionary

  • hypersomnia — noun an inability to stay awake • Ant: ↑insomnia • Hypernyms: ↑sleep disorder • Hyponyms: ↑catalepsy, ↑narcolepsy * * * ˌhīpə(r)ˈsämnēə noun …   Useful english dictionary

  • hypersomnia-bulimia syndrome — Kleine Levin s …   Medical dictionary

  • Гиперсомния (Hypersomnia) — патологическая сонливость; сон, длящийся очень долгое время (иногда наблюдается при воспалении головного мозга). Источник: Медицинский словарь …   Медицинские термины

  • primary hypersomnia — [DSM IV] a dyssomnia consisting of persistent excessive sleepiness and sleeping, with prolonged sleep episodes or regularly occurring voluntary or involuntary napping, and not due to any other psychological or physical condition …   Medical dictionary

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