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Nap architecture impacts immediate and long-term sleepiness following a nap. A brief nap with ligher sleep stages (NREM1 and NREM2) reduces sleepiness immediately after the nap, while a nap containing SWS may bring on sleep inertia [7,8]. However, there is a delayed benefit of naps that contain SWS. After sleep inertia has dissipated, sleepiness is lower for longer.
