A review of short naps and sleep inertia: Do naps of 30 min or less really avoid sleep inertia and slow wave sleep?

Napping is a widely used countermeasure to sleepiness and impaired performance caused by sleep loss and circadian pressure. Sleep inertia, the period of grogginess and impaired performance experienced after waking, is a potential side-effect of napping. Many industry publications recommend naps of 30 minutes or less in order to avoid this side-effect. However, the evidence-base for this advice has yet to be thoroughly reviewed.

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