Passage OneSound sleep occurs when one's internal clock is regul

Passage One
Sound sleep occurs when one's internal clock is regulated. Circadian rhythms（生理节奏）can become compromised quite easily. Many people with sleep troubles tend to vary bedtimes. To avoid this common problem, sleep sufferers should go to bed and wake up at the same time every day. to help improve circadian rhythms, sufferers should enjoy 15 minutes of sun exposure the first thing in the morning.
A bedtime routine can help prevent insomnia（失眠）. One hour before bedtime, one should lower the lights and relax. Reading a book or listening to calm music can help prepare the body for a good night's sleep. Taking a warm, candlelit bath or drinking a cup of warm milk can also help you prepare for deep sleep at night.
Stress can have a bad effect on the body and the ability to sleep. A daily exercise routine can help lower the body's stress naturally. One can also manage stress by writing diaries. Writing diaries can help people express their anxieties, plan for the future and improve sleep. Other ways to lower stress include deep breathing exercises and progressive muscle relaxation.
The light sending out from computers, cellphones, tablets and televisions can cause sleep problems. Therefore, these items should be turned off at least an hour before bedtime. Additionally lowering the backlight on these electronic devices earlier in the evening can help you fall asleep faster and stay asleep longer once bedtime arrives.
A perfect bedroom invites sweet sleep. Most people sleep better in a cool, dark, and quiet room. Lower the temperature in the room to 16~20 degrees for a peaceful night's sleep. A dark room can be accomplished by installing light blocking curtains or wearing a sleep mask. Noise can be reduced with either earplugs or a white noise machine. Finally, a comfortable mattress（床垫）and pillows are essential to a good night's sleep.
What can be done to reduce stress?
A、Doing exercise every day.
B、Making plans for the future.
C、Writing about your sleep patterns.
D、Learning to hold your breath.
【正确答案】：A
【名师解析】:根据文章内容，降低压力的方法包括日常锻炼、写日记、深呼吸练习和渐进性肌肉放松。选项A中的“每天进行锻炼”是其中一种有效的方法，可以帮助降低身体的自然压力。选项B“为未来做计划”是写日记时可以帮助人们做的事情，但不是直接降低压力的方法。选项C“记录你的睡眠模式”并未在文中提及为降低压力的方法。选项D“学会屏住呼吸”同样没有在文中提到，并且这并不是一个健康的压力管理方法。因此，正确答案是A。