How often have you hit that post-lunch lull and wished you could put your head down for a quick snooze? In many nations around the world, a midday break is common when businesses and stores close and everyone gets a chance to relax. But in America, napping is often seen as an indulgence, says Dr. Sarah Mednick, research scientist at the University of California and author of Take a Nap: Change Your Life. "We're driving ourselves super hard " We're also the most stressed-out nation in the world. We have to balance our work and drive with healthier practices."

How often have you hit that post-lunch lull and wished you could put your head down for a quick snooze? In many nations around the world, a midday break is common when businesses and stores close and everyone gets a chance to relax. But in America, napping is often seen as an indulgence, says Dr. Sarah Mednick, research scientist at the University of California and author of Take a Nap: Change Your Life. "We're driving ourselves super hard - We're also the most stressed-out nation in the world. We have to balance our work and drive with healthier practices."

Not just for children, a nap can improve your alertness and stamina, level your moods, increase memory retention, and boost complex motor skills. Experts say it can also play a role in heart function, hormone maintenance and cell repair. And these benefits can begin in as little as five minutes!! But who has time for a nap?

The key, says Tanya Breshears, respiratory therapist with Advance Sleep Disorder Center in Medford, is in the timing. In fact, less may be more when you just want to increase your energy level or alertness during the day. "There are those, like me, that benefit more from a power nap." A power nap — typically 20 to 30 minutes — is something most people can fit into a lunch hour. "In the same time it takes to make coffee, you could have a nap," says Mednick, producing the same increased alertness and productivity without interfering with your nighttime sleep. And since most people experience a low-energy period around lunch time (or six to eight hours after waking), a bite to eat and a nap make perfect sense.

Mednick's research into napping has shown that different amounts of sleep benefit different cognitive and motor skills. Because your body stays in the earlier stages of sleep during a power nap, it is easy to wake up alert and rested, ideal for a physical laborer, for example. For someone facing complex mental processing, like a student, a longer nap will yield more benefits. Mednick compares sleeping for 50 to 60 minutes to "clearing the desktop" as the brain clears many of the multi-tasking connections it forms during complex mental tasks. And a full-cycle nap, usually about 90 minutes, boosts perceptual skills and creativity in the REM (Rapid Eye Movement) stage.

Ready to try? Mednick recommends finding a quiet, safe and comfortable ("not too comfortable") spot. "A lot of people nap in their cars," she observes. "It's a perfect place to not sleep for too long." A comfortable sofa, a reclining chair or even a pillow on the floor will also work. A light blanket can be handy, as body temperature tends to drop during sleep. Then set an alarm for 20 to 30 minutes (especially important for people napping in a work situation) and quiet your mind. Some people use eyeshades, dim lights or soft music to create a soothing atmosphere. It may take a few attempts, but even the relaxation will benefit you, and you may be surprised to find you've slept after all.

"You can learn how to eat well and exercise well," says Mednick. "You can also learn to nap well."

Everyone is physically able to nap, but nappers occasionally have difficulty waking feeling rested. Called sleep inertia, that groggy feeling following a nap comes from waking during Slow Wave Sleep, says Mednick, who recommends either shortening or lengthening your nap time to avoid waking during that phase of sleep. "It's harder when you get into a deeper sleep. It's harder to wake up raring to go," confirms Breshears. A splash of cold water or some quick exercise should help clear the fog.

Both Mednick and Breshears say that 90 minutes should be the limit for a daytime nap. "Typically, I would say that anything over an hour to an hour and a half is too much," says Breshears. Mednick adds, "You don't want to be napping within three hours of your night sleep time or beyond 90 minutes."

So next time you find yourself drowsy in the daytime, find a quiet spot, set the alarm - and happy dreams.