Meaning of “insomniac” in the English Dictionary

british dictionary

"insomniac" in British English

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insomniacnoun [ C ]

uk /ɪnˈsɒm.ni.æk/ us /ɪnˈsɑːm.ni.æk/

someone who often finds it difficult to sleep

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