In fact, a study (click HERE to see it) published in PubMed in 2002 found that even a 5- or 10-minute nap creates a heightened sense of alertness/focus/wakefulness and increased cognitive ability compared to not napping. So if you want to recharge quickly, take a 10-20 minute nap, and for deep sleep rejuvenation.

In addition to these recommendations, a surprising suggestion is to sit slightly upright during your nap, as this will help you avoid falling into a deep sleep. And if you find yourself daydreaming during your naps, it may be a sign of sleep deprivation.