insomniac

An insomniac is someone who can't sleep, someone who stares at the ceiling all night or watches the minutes tick by on the alarm clock or counts sheep into the millions.

Eight hours of sleep per night is considered healthy, but just think of how much more you could get done if you didn't need any at all. If you're an insomniac, though, it's not that you don't need sleep — it's that you can't get any at all. Break down the Latin root word and you get in- and somnus: "not sleep." "Not sleep!" is how you might start talking after several agonizing days of sleeplessness and walking into walls and assigning a name to every sheep that jumps the fence.

Definitions of insomniac
  1. noun
    someone who cannot sleep
    synonyms: sleepless person
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    type of:
    diseased person, sick person, sufferer
    a person suffering from an illness
  2. adjective
    experiencing or accompanied by sleeplessness
    insomniac old people”
    insomniac nights”
    synonyms: sleepless, watchful
    awake
    not in a state of sleep; completely conscious
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