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In today's world, sleep experts often say that for a better
night's rest, Americans should turn {#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 regularly 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 (减少) the brain chemicals that help {#blank#}4{#/blank#} (sleep). In the study, the
researchers let volunteers read, play games and watch movies on a screen for
different time while measuring {#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 {#blank#}7{#/blank#}
often used computers at night. They got the {#blank#}8{#/blank#}(similar) results. And
researchers say that may not only cause sleeplessness, but also
{#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 computers {#blank#}10{#/blank#}(little) than before, or turn down our screens as
much as possible before sleeping.
