The main idea of the article is that ________.
(a) our sleep time over the past century has been reduced by about 20%
(b) sleep debt accumulates and harms our health and we need to adopt a sleep-smart lifestyle
(c) biological clock within us regulates sleeping and waking and sleep debt always exists
(d) sleep deprivation might lead people to make mistakes with tragic consequences
1. A sleep-deprived person is ________.
(a) one who sleeps less than 8 hours
(b) liable to have very brief lapses of consciousness
(c) liable to make mistakes but even-tempered
(d) alert at the crucial or thrilling moment
2. Which of the following is NOT true with the volunteer in the experiment at Stanford University?
(a) He pressed a button as required to the end of the experiment.
(b) He kept his eyes wide open during the procedure.
(c) He only slept four hours the night before having the experiment.
(d) He dozed off for a moment with eyes wide open.
3. According to the article, which statement about sleep debt is wrong?
(a) "Sleep debt" is a term created by the author and his colleagues.
(b) The term implies that if you sleep less than you need, you tend to sleep during the daytime.
(c) Sleep debt accumulates day by day and must be paid back.
(d) In reality, lost sleep can be made up by sleeping all day long on weekends.
4. What can be inferred from "clock-dependent alerting"?
(a) A biological clock makes us alert when we need to be.
(b) The late afternoon/evening period of mental alertness results from a lack of sleep.
(c) Clock-dependent alerting redeems a person's heavy load of sleep debt.
(d) Even if a person has worked all day and didn't make up the lost sleep, he would still be likely to feel alert at the same time every evening.
5. Concerning the relation between sleep and mortality, which statement is true?
(a) Sleep disorders may occur to those long sleepers and cause health problems.
(b) Those who sleep longer than normal are likely to live longer.
(c) Those who sleep less would die earlier than those who sleep more.
(d) Sleep debt affects one's mood less than his cognitive skills.
6. The test held by Roth shows that ________.
(a) an 8-hour-sleep is enough to keep a person alert in daytime
(b) though an 8-hour-sleep makes people feel fine, some of them are not so alert in daytime as they believe
(c) a good night's sleep can work off a person's sleep debt
(d) if a person sleeps more than 8 hours, he is sure to feel well
7. "Lark" in the article refers to one ________.
(a) whose strongest period of clock-dependent alerting occurs in the morning
(b) whose strongest period of clock-dependent alerting occurs in the evening
(c) who tends to wake up late
(d) who tends to stay up
8. To avoid accumulating large sleep debt, you are not to ________.
(a) know the amount of sleep you need each day
(b) adjust your sleep according to your biological clock
(c) sleep as much as possible
(d) consult specialists for help
The article has five parts. Please arrange the main ideas in the correct order according to the text.
Sleep debt is a national emergency.
The mechanism of sleep debt
The mechanism of clock-dependent alerting
Effects of sleep deprivation on health and well-being
Suggestions on a sleep-smart lifestyle