Definition of "insomniac" []

• One who suffers from insomnia. (noun)
• Having or causing insomnia. (adjective)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "And that's what we call insomniac math — three plus three equals eight."
• "Several weeks on the insomniac is unsteady on his feet, wracked by fevers, and drifting in an out of delirium as the body's vital organs begin to fail."
• "Old guys spend more time sitting up late after the family's asleep, and in these hours your old guy will plan and replan his upcoming expedition, put new laces on his wading shoes, tie flies, dress in all his Arctic gear in order to see what it's like to move around in, call another insomniac old guy and check out up-to-the-minute river conditions, and so on."