Top Definition
The sensation of being half conscious or only partially awake usually occurring immediately after waking up. It is also accompanied by a desire to continue sleeping.
Jim awoke early one morning for work after a rather weak-ass sleep. The force of his sleep inertia was strong that morning. So strong in fact that Jim couldn't help himself but fall back to sleep, consequently missing his shift.
by Woody89 July 27, 2012

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