insomniac
noun
[ ɪnˈsɒmnɪak ]
• a person who is regularly unable to sleep.
• "I'm a terrible insomniac, I often write from four in the morning to seven"
insomniac
adjective
• regularly unable to sleep.
• "as the host of an all-night radio show, Shepard would commune with his insomniac listeners"
