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Sleeping with a light on could be
for you. Researchers from Tulane University in the USA say any
of light at
could be bad for your heart. Even a very
light could be harmful. The researchers did tests on 11,000 people for a week. The test
wore sensors that measured the amount of light in their bedrooms. People who did not have heart disease had an MRI
three years later. The scans showed there was a
between sleeping with a light on and changes in the structure of the heart. One
was thicker heart muscles. Another change was that people's hearts were less able to pump
, stretch, and relax during
.
