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"Recent studies have found that it is not just how long we sleep that can affect our weight, but when we wake up. Should we all be jumping out of bed at dawn?"
Want to lose weight? Get a good night's sleep. Research increasingly suggests that chronic sleep deprivation can lead to weight gain. But last week a paper in the Public Library of Science's peer-reviewed resourcePLOS One said that it is not just how many hours of sleep you get each night that matters, but when you wake up too.
People who were exposed to bright light in the morning had lower body mass indexes (BMI) than those who were exposed to most of their light later in the day. The finding was independent of the amount of calories eaten. Dr Phyllis C Zee, a senior author of the paper said that even 20 to 30 minutes of outdoor light before midday could affect BMI.
