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The key for
people to sleep well at night could be how hot or cold their
is. Researchers say the best way to get a good night's
is to make sure the
is between 20-25º Celsius. The researchers are from Harvard University and the Hinda and Arthur Marcus Institute for Aging Research in the USA. They asked 50 people aged 65 and
to wear a sleep
for a year and a half. The researchers found that the
of sleep worsened when the room
was outside the 20-25-degree range. They also observed that 20ºC was the
temperature. The lead researcher said: "Sleep tends to come easier and is often
and more restful in a cooler environment."
