Many people like to keep a night light on while they sleep, but now there’s evidence it may disrupt blood sugar control – which could help explain why the habit is linked with obesity and diabetes.
Phyllis Zee
Her team investigated the link by asking 20 healthy volunteers to spend two nights in their sleep lab. On the first night, all participants slept in a very dark room. On the second, half slept with a lighting level of 100 lux, equivalent to keeping a TV or bedside light on or having a bright street light shining through thin curtains.
People who slept in the dimly lit room on their second night had slightly worse blood sugar control than on their first night, when the room was nearly dark. “They thought they slept well, but yourPeople who had two nights under dark conditions had little difference in their blood sugar control.
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