词语运用
In
today's world, sleep experts often say that for a better night's rest,
Americans should turn o{#blank#}1{#/blank#} their smart phones or iPads before sleeping.
Such electronic products make the brain more {#blank#}2{#/blank#}(act),
and then influence their sleep. But according to a latest survey, more than 90%
of Americans often use a computer or some other {#blank#}3{#/blank#}(kind)
of electronic products in the hour before bed.
Researchers
find that man-made light from some electronic products at night may reduce the
brain chemicals that help to s{#blank#}4{#/blank#}.
In the study, the researchers let volunteers read, play games and watch movies
on a screen for different time while measuring(测量) {#blank#}5{#/blank#} much light their eyes received. They found
that two hours of {#blank#}6{#/blank#}(sit)
before a bright screen at night reduced the sleep chemical levels by about 22%.
Then
the researchers studied the college students who often {#blank#}7{#/blank#}(use)
computers at night. They got the s{#blank#}8{#/blank#} results. And researchers say that may not only
cause sleeplessness, but {#blank#}9{#/blank#} raise the risk of obesity（肥胖症）,
diabetes（糖尿病）and
other diseases.
To
be on the safe side, the researchers suggest that we should use computer {#blank#}10{#/blank#}(little)
than before, or turn down our screens as much as possible before sleeping.
