“Being in the dark” has benefits

Randy Nelson, who chairs the Department of Neuroscience in the West Virginia University School of Medicine, is exploring how maintaining a truly dark sleeping environment may make it easier to keep weight off.


“Being exposed to light at night changes how the “clock” genes that regulate our biological rhythms are expressed. Normally, encountering light upon waking in the morning synchronizes our internal body clock. “Think of it like an old-fashioned watch that gains 15 minutes every day. The way that it could still work as a good 24-hour clock is if you set this watch back 15 minutes whenever you wake up,” said Nelson, who directs basic science research for the WVU Rockefeller Neuroscience Institute.”

“But exposure to light at night can “hijack these clockworks,” he said, and the effects can be surprising. He and his colleagues have found that being exposed to light at night-even if it’s as dim as a nightlight-correlates to weight gain in animal models. Instead of confining their eating to the usual time of day, the animals ate around the clock, and they weighed more than their counterparts that experienced typical bright days and dark nights.”

“Nighttime light does more than disturb regular eating patterns. It also interferes with metabolic processes. “It’s well established that the feeding cycles are phase-locked-to use an engineering term-to the circadian cues,” said Nelson. “If you’re a day-active creature, like most of us, then we eat during the day. That’s when our metabolism is set up to process food, when our insulin starts going up, when we’re ready to deal with calories coming in.” Calories we take in at night don’t benefit from these favorable metabolic conditions. Our bodies don’t process them as much, and they tend to get stored as fat.”


5 comments on ““Being in the dark” has benefits

  1. It seems like we could counteract the night time weight gain by simply eating earlier. I keep on a tiny nightlight in the bathroom that gives just enough light that I can get up if I need to and not bump into stuff. And not fall for not being able to see.
    Some studies need more study – and some practical considerations.


    • Mirium,
      There is good and bad news about night shifts. The good news is that some people are naturally night owls, so they may do better on night shift than most. The bad news is that research shows night shifts are bad for your health. People who work at night are at increased risk for depression, heart disease, cancer, and G.I. problems, among others.
      Sleep well,


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