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Sleep is
for our health. It is important to sleep in the
. Sleeping with the light on could be
for us. Turning off the light helps to keep away
and heart
. Around 40 per cent of people sleep with some sort of
light, like a television or alarm
. The worst thing is sleeping with a
light. Sleeping in the dark is more difficult for people in
. This is because there is a lot of
light at night.