But for most, naps can make you feel sharper and happier. Naps provide different benefits

　　9

　　on how long they are. A 20-minute nap will boost alertness and concentration; a 90-minute snooze（小睡）can

　　10

　　creativity.

　　According to prevention.com, you

　　11

　　a natural dip in body temperature between 1 p.m. and 3 p.m. A short nap at this time can boost alertness for several hours and, for most people, shouldn’t

　　12

　　being able to fall asleep at night.

　　Pick a dark, cozy place that’s not too warm or too chilly. Prevention.com

　　13

　　napping on the couch instead of in bed, so you’re less

　　14

　　to snooze for too long.

　　Surprisingly, the best place to take a nap may be a hammock（吊床）if you have one. A Swiss study

　　15

　　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 puts babies to sleep works wonders for grown-ups, too.

　　1. A. relieve

　　B. promote

　　C. operate

　　D. support

　　2. A. feeling

　　B. frame

　　C. sense

　　D. mind

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