How long to sleep: Naps provide different benefits depending on how long they are, says MentalFloss.com. A 20­minute nap will promote alertness and concentration; a 90­minute nap which includes deeper stages of sleep, can strengthen creativity. The danger zone is when you're somewhere in between, because waking up in the middle of a sleep cycle can lead to sleep inertia(惯性). So stick to 20 or 90 minutes for maximum benefits. If you wake up from a nap feeling confused or more tired, it's likely that your timing was just off.

　　What time to sleep: Prevention.com says that you experience a natural dip in body temperature (the same kind that makes you feel sleepy at night) between 1 p．m. and 3 p．m. A power nap at this time can promote alertness for several hours and, for most people, won't affect being able to fall asleep at night.

　　How to get comfortable: MentalFloss.com says it takes about 50 percent longer to fall asleep sitting up than lying down. (That's why we sleep so poorly on planes and trains！) Pick a dark, cozy place that's not too warm or too chilly. Prevention.com recommends napping on the couch instead of in bed, so you won't snooze for too long.

　　Surprisingly, the best place to sleep may be a hammock (吊床) if you have one. A Swiss study published last year found that people fell asleep faster and had deeper sleep when they napped in a hammock than in a bed. That same rocking motion that causes babies to sleep works wonders for grown­ups，too.： It sounds strange, but drinking coffee right before a nap may be the perfect aid for maximum alertness. Since caffeine takes 20 to 30 minutes to take full effect, you'll feel even more alert after your 20­minute nap.Title：How to Take a Nap

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