I. -ēˌak noun
( -s )
Etymology: Latin insomnia + English -ac (as in maniac )
: a person suffering from insomnia
II. adjective
1. : affected with insomnia
an insomniac boy
2.
a. : characteristic of or occurring during a period of sleeplessness
insomniac distress
these tumbling insomniac ideas
b. : associated with or tending to cause sleeplessness
humid insomniac nights
the insomniac flapping of the canvas — S.N.Behrman