Top Definition
The effects of not sleeping, which leaves one ineffective the following day. Symptoms may include aches, pains, and general crankiness.
Q: "What is with James today? He can't seem to function and keeps whining about being tired and achy."

A: "He said he couldn't sleep last night... must be an insomnia hangover."
by jmsanddontyouforgetit January 04, 2012

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