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What is Sleep Inertia

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Updated February 18, 2014

Definition: Sleepiness and cognitive and psychomotor impairment that can occur immediately after awakening. These difficulties may persist for minutes to an hour or more after awakening. This may occur more commonly when awakening from slow-wave sleep or when sleep duration is insufficient.
Examples:
This morning the grogginess caused by my sleep inertia was so bad that I decided to go back to bed.
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