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概要写作1 Are you sick of going to bed late and waking up tired? Then grab your hiking boots and a ten

英语作文范文 03-05
概要写作一
1   Are you sick of going to bed late and waking up tired? Then grab your hiking boots and a tent. A new study suggests that a couple days of camping in the great outdoors can reset your circadian clock and help you get more sleep.
2   The circadian clock, more commonly known as the body clock, is an internal system that tells our bodies when it’s time to go to sleep and when it’s time to wake up. Scientists track this clock by measuring the amount of melatonin circulating in a person’s blood at any given time. In a healthy sleeper, melatonin levels rise a few hours before bedtime, stay high through the night, and then settle back down when it’s time to wake up.
3   In our modern society, however, most of us stay up many hours past sunset and would probably sleep in many hours after sunrise if we could. And the trouble is, your melatonin levels may still be high when your alarm clock goes off in the morning, which leads to grogginess. It may also have other health consequences as well, such as diabetes, overweight and heart disease.
4   Professor Kenneth Wright of the University of Colorado in the US wanted to see if our body clocks can be reset by a short stay in nature. His team recruited 14 physically active volunteers in their 20s and 30s. Nine went on a weekend camping trip, while the other five stayed home. At the end of the weekend, the researchers reported that in just two days, the campers’ body clock had shifted so that their melatonin levels began to rise more than an hour earlier than they did before they left on the trip. By contrast, the body clocks of the group that stayed home shifted even later over the course of the weekend. “This tells us we can reset our clocks fast,” Wright said.
5   Therefore, if you want to change your sleep patterns you could try to increase your exposure to natural light during the day and decrease the amount of artificial light you see at night.

要点1:  A new study shows that outdoor campings can reset a person’s circadian clock and improve sleeping.
要点2: The circadian clock, an internal system, schedules your sleeping time guided by the amount of melatonin.
要点3: But people’s irregular sleeping habit disturbs the rise and fall of melatonin, which causes tiredness and diseases.
要点4: Wright’s experiment proved that our clocks can be reset.
要点5:   So we’d better expose ourselves to natural light more than artificial light.
 
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