But on average, Americans sleep only about seven and a half hours per night, a marked drop from the nine hours day averaged in 1910. What's worse, nearly one third of all Americans get less than six hours of sleep on a typical work night. For most people, that's not nearly enough.
Finding ways to get more and better sleep can be a challenge. Scientists have identified more than 80 different sleep disorders. Some sleeping disorders are generic. But many problems are caused by staying up late and sleeping in, by traveling frequently between time zones or by working nights. Dr. James. F. Jones at National Jewish Medical and Research Center in Denver says that sleep disorders are often diagnosed as other discomforts. About one third of the patients who referred to him with possible chronic fatigue syndrome actually have treatable sleep disorders. "Before we do anything else, we look at their sleep," Jones says.
Sleep experts say that most people would benefit from a good look at their sleep patterns, "My motto (座右铭) is 'sleep defensively'," says Mary Carskadon of Brown University. She says people need to carve out sufficient time to sleep, even if it means giving up other things. Sleep routines—like going to bed and getting up at the same time every day—are important. Pre-bedtime activities also make a difference. As with Elsneer, who used to suffer from sleeplessness, a few lifestyle. changes—avoiding stimulants and late meals, no exercising before bedtime, but relaxing with a hot bath—yield better sleep.
What is TRUE of human sleep?
A.Most people need less sleep when grown older.
B.Most people need seven and a half hours of sleep every night.
C.On average, people in the US today sleep less per night than they used to.
D.Most people need more sleep when they are under pressure.
第2题
可引起子代先天性心脏病、面部畸形的是
A、高热
B、噪音
C、核辐射
D、极低频电磁场
E、极高频电磁场
第5题
急性肾盂肾炎的高热对于妊娠的影响不包括
A、妊娠早期高热可使胎儿神经管发育障碍的发生率增高
B、妊娠早期高热使无脑儿发生率增高
C、妊娠期高热可导致早产
D、妊娠早、中期高热可使胎儿泌尿生殖系统畸形发生率增高
E、妊娠期高热可导致流产
第7题
急性肾盂肾炎的高热对于妊娠的影响,不包括
A、妊娠早期高热可使胎儿神经管发育障碍发生率增高
B、妊娠早期高热使无脑儿发生率增高
C、妊娠期高热可导致早产
D、妊娠早中期高热可使胎儿泌尿生殖系统畸形发生率增高
E、妊娠期高热可导致流产
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