In many parts of the world, people take naps (小睡) in the middle of the day. This is especially true in warmer climates, where the heat makes work difficult in the early afternoon. Researchers are now saying that naps are good for everyone in any climate. A daily nap gives one a more rested body and mind and therefore is good for health in general. In countries where naps are traditional, people often suffer less from problems such as heart disease. Many working people, unfortunately, have no time to take naps. Though doctors may advise taking naps, employers don't follow it! If you do have the chance, however, here are a few tips about making the most of your nap. Remember that the best time to take a nap is about eight hours after you get up. A short sleep too late in the day may only make you feel more tired and sleepy afterward. This can also happen if you sleep for too long. If you do not have enough time, try a short nap — even ten minutes of sleep can be helpful.

　　4．Why do you sometimes feel sleepy in the early afternoon?

　　A．Because you eat too much for lunch.

　　B．Because it's hot in summer.

　　C．Because your body temperature goes down at that time.

　　D．Because you didn't have a good sleep last night.

　　解析：选C　细节理解题。根据第一段中的“However, the real reason lies inside their bodies. At that time — about eight hours after you wake up — your body temperature goes down.” 可知选C。

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