People who sleep with a light on may be unwittingly keeping their nervous system awake, a small study suggests.
of U.S. women found that those who slept with a light or TV on tended to gain more weight over time, and were more likely to become obese, compared to lights-off sleepers.
But there's been little in the way of lab research to search for potential mechanisms, said Matt Lehrer, an assistant professor at the University of Pittsburgh who studies sleep and circadian rhythms.Future research, Lehrer said, could include people who already have insulin resistance and elevated blood sugar, to see if lights-on sleeping makes the issue worse.
Compared with other lifestyle factors, like diet and exercise, less is known about the health effects of light exposure, Lehrer pointed out. But, he said, people should be aware that it matters. Zee agreed, and noted that getting sunlight during the day is just as important as limiting artificial light at night.SOURCES: Phyllis Zee, MD, PhD, chief, sleep medicine, Northwestern University Feinberg School of Medicine, Chicago; Matt Lehrer, PhD, assistant professor, psychiatry, University of Pittsburgh; Kannan Ramar, MD, immediate past president, American Academy of Sleep Medicine, Darien, Ill., and professor, division of pulmonary and critical care medicine, Mayo Clinic, Rochester, Minn.
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