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We
know that going to bed early is
. Scientists say the
time to go to bed is between 10pm and 11pm. This is because it lowers the
of heart disease. Six years ago, the
looked at the sleep
and sleeping and waking
of 80,000 people. They then monitored the people's
for six years. Around 3,000 people developed heart
. They went to bed
than 10pm or later than 11pm.
