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The researchers are from a
of medicine in Chicago, USA. Researcher Dr Phyllis Zee is an
in sleep medicine. She said it is healthier to turn off all lights when we sleep. She conducted a
of the blood sugar levels of 20 people after nights of sleep. The people who slept with a
on had higher sugar
than those who slept in
. Dr Zee said light stimulates brain
, which raises blood sugar. She said there are three
we can do to reduce the risk of
: turn off the lights, never sleep with white or blue light; and wear an eye
.
