While We Sleep, Our Brains Are Hard at Work
From VOA Learning English,
this is the Health Report.
Why do we need sleepฦ? Do our brains turn
off for the nightฦ? Scientists recently
discovered that our brains may be just as
busy at night as they are during the day.
While we sleep, our brains are doing much
more than getting ready for the next day.
Researchers at the University of Rochester
found that the brain may be busy cleaning out
harmful waste materials. The researchers
studied mice that had colored dye injected
into their brains. They observed the brains of
the mice as they slept and when they were
awake. The researchers say they saw that
the brains of sleeping mice were hard at work.
Dr. Maiken Nadergard led the study. He says
our brains perform two very diffent jods. He
says, when we are awake, our brain is hard at
work processing information about our
surondings. But at night, our brain works to
remove all the waste that builds up during
waking hours. The researchers say the waste
meterial includes poisons, or toxins,
responsible for brain disorders such as
Alzheimer's disease. They also found that
during sleep, the brain's cells shrink. This
shrinking permits wasts to be removed more
effectively. The brain's cleaning system could
only be studied eith new imagihg
technologies. And test animals must be alive
in order to see the brain process as it
happens. Dr.Nedergaard says the next step
is to look for the process in human brains.
She says the results shw just how important
sleep is to health and fighting disease. The
research may also lead to treatments that
prevent or help fight neurological disorders.
For VOA Learning English,
While We Sleep, Our Brains Are Hard at WorkFrom VOA Learning English,this is the Health Report.Why do we need sleepฦ? Do our brains turnoff for the nightฦ? Scientists recentlydiscovered that our brains may be just asbusy at night as they are during the day.While we sleep, our brains are doing muchmore than getting ready for the next day.Researchers at the University of Rochesterfound that the brain may be busy cleaning outharmful waste materials. The researchersstudied mice that had colored dye injectedinto their brains. They observed the brains ofthe mice as they slept and when they wereawake. The researchers say they saw that the brains of sleeping mice were hard at work.Dr. Maiken Nadergard led the study. He saysour brains perform two very diffent jods. Hesays, when we are awake, our brain is hard atwork processing information about oursurondings. But at night, our brain works toremove all the waste that builds up duringwaking hours. The researchers say the wastemeterial includes poisons, or toxins,responsible for brain disorders such asAlzheimer's disease. They also found thatduring sleep, the brain's cells shrink. Thisshrinking permits wasts to be removed moreeffectively. The brain's cleaning system couldonly be studied eith new imagihgtechnologies. And test animals must be alivein order to see the brain process as ithappens. Dr.Nedergaard says the next stepis to look for the process in human brains.She says the results shw just how important
sleep is to health and fighting disease. The
research may also lead to treatments that
prevent or help fight neurological disorders.
For VOA Learning English,
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