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Why do many of
us find {#blank#}1{#/blank#} difficult or impossible to fall asleep in a bed other than our
own? Is it because the bed is {#blank#}2{#/blank#} (comfort)? According to a new study
published in Current Biology, a significant reason is {#blank#}3{#/blank#} the scientists
call "first night effect". They believe that one side of the brain
acts as a "night watch" to warn us about potential dangers. It forces
us {#blank#}4{#/blank#} (stay) awake on the first night in a new environment.
For the study, 35
young volunteers {#blank#}5{#/blank#} (ask) to sleep in a sleep lab for several days. Meanwhile,
researchers watched their brain activities.
According to the
researchers, on their first night, the left brains were {#blank#}6{#/blank#} (active) than
the right brains and people had a hard time sleeping. However, left-brain
activity decreased as days went by, {#blank#}7{#/blank#} (fall) even to the point of
complete calm. In this process, the participants got an increasingly better
sleep experience.
The {#blank#}8{#/blank#} (finding)
suggest that the different rhythms of the sides of the brain affect our sleep. When
the two sides work {#blank#}9{#/blank#} (different), the balance between them is broken. Thus,
the brain can't relax and is sensitive to anything strange in the surroundings,
just {#blank#}10{#/blank#} it is in the daytime.