Meaning of “hypersomnia” in the English Dictionary

british dictionary

"hypersomnia" in British English

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hypersomnianoun [ U ]

uk /ˌhaɪ.pəˈsɒm.ni.ə/ us /ˌhaɪ.pɚˈsɑːm.ni.ə/ specialized

a sleep disorder in which someone sleeps for very long periods and is always very tired during the day

(Definition of “hypersomnia” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)