INSOMNIAC
Meaning of INSOMNIAC in English
in ‧ som ‧ ni ‧ ac /ɪnˈsɒmniæk $ ɪnˈsɑːm-/ BrE AmE noun [countable]
someone who cannot sleep easily
—insomniac adjective
Longman Dictionary of Contemporary English.
Longman - Словарь современного английского языка.
2012