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Sleeping in on Saturday after a few weeks of too little shuteye may feel refreshing,but it can give a false
sense of security.
New research shows longterm sleep loss cannot be cured that easily.Scientists researched the effects of
shortand longterm sleep loss and found that those who suffer longterm sleep loss may function normally so
on after waking up,but experience steadily slower reaction times as the day goes by,even if they had tried
to catch up the previous night.
The research has important safety significances in an increasingly busy society,not just for shiftworkers
but for the roughly one in six Americans who regularly get six hours or less of sleep a night.
"We know that staying awake 24 hours without sleep will affect your performance to do all sorts of
things,and this effect equals to drinking too much when driving," said lead researcher Dr Daniel Cohen of
Boston's  Brigham  and  Women's Hospital. But when those who suffer longterm sleep loss become
allnighters,"the harm is increased ten times," Cohen said.
The National Institutes of Health says adults need seven hours to nine hours of sleep for good health.
Regularly getting too little sleep increases the risk of health problems,including memory impairment and a
weakened immune system.More immediately,too little sleep affects reaction times；sleepiness is to blame
for car crashes and other accidents.
It has critically important complicated and unexpected results for anyone who works "crazy hours" and
thinks they are performing fine with a few hours of weeknight sleep,said Harris,director at New York's
Montefiore Medical Center."Don't think you can justbank_upyour sleep on the weekend,because it
doesn't work that way," he warned.
1．The text mainly advises people________.
A．to sleep more time
B．to sleep in on Saturday
C．to sleep scientifically
D．to sleep little on weekend
2．People with longterm sleep loss________.
A．are quicker in thinking
B．may feel refreshed soon after waking up
C．are surely energetic
D．can have a strong sense of security
3．What can we learn from the text?
A．Most of the Americans get six hours or less of sleep a night.
B．Staying up is worse for those who suffer longterm sleep loss.
C．Traffic accidents have little to do with sleepiness.
D．One in six Americans are allnighters.
4．Which of the following is the immediate effect of longterm sleep loss?
A．Health problems
B．Immune system
C．Reaction times
D．Memory impairment
5．The underlined phrase "bank up" in the last paragraph most probably means________.
A．accumulate
B．recover
C．allocate
D．credit

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