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Sleep is
for our health. Not everyone knows it is important to sleep in the
. Researchers say sleeping with the light on could be
for us. Turning off the light when we sleep helps to keep away
and heart disease. Light could increase the
of getting these diseases. Around 40 per cent of people sleep with some sort of
light, from a television,
clock or something else. The worst
is sleeping with a main light. Sleeping in the dark is more
for people in cities, where there is a lot of
light at night.
