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about two hours after they wake up. In essence, Wright said, their biological night is still in effect even though they are awake.

Past studies have found that in the typical artificially lit lifestyle, people's melatonin levels do not drop off until Nike Mag Cleats

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It would "make much more sense" for the melatonin pattern to Nike Mag For Sale 2017 look like that of the campers in this study, Wyatt said.

And it's possible, he noted, that exposure to artificial light at night and a lack of sun during the day are contributing to some people's sleep problems and morning grogginess.

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There are still plenty of questions, he cautioned. "This is a tantalizing study, but it's preliminary." The experiment, Wyatt said, needs to be repeated in larger Nike Dunk Pigeon 2018

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What does seem clear, Wright added, is that "the type of light we're exposed to really does have a big impact on our biology."

For one, they may offer an explanation for why melatonin levels typically don't hit their low until two hours after people wake up, said James Wyatt, an associate professor of behavioral sciences at Rush University Medical Center in Chicago.

´╗┐Camping Sets Body Clock In Tune With Nature

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For the study, reported in the Aug. 1 online issue of Current Biology, Wright's team recruited eight healthy adults who stuck with their normal daily routines for one week, and then spent another week camping together. During the trip, the only lights allowed were sunlight and campfire light.

More importantly, the campers' "biological night" kicked in about two hours earlier, Wright said. That is, their melatonin levels began to rise around sunset, and then drop off around sunrise, almost an hour before they woke up.

At the end of each week, the researchers took saliva samples to measure study participants' melatonin a hormone that becomes more active in the evening, to help people fall asleep, then drops off in the early morning so they can wake up bright eyed. On the camping trip, however, they turned in earlier and rose earlier.

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groups of people, and in different settings.

And what's the big deal about that? It's not clear yet, according to Wright. "Does it make a difference in how they feel?" he said. "That's an important question."

The new findings are "not surprising," said Dr. Jordan Josephson, an ear, nose and throat, and sleep specialist at Lenox Hill Hospital in New York City. He noted that it's known, for example, that people who do shift work and are exposed to artificial light when the outside world is dark often suffer from fatigue.

"What we found suggests that it's not just artificial light that's keeping us awake," Wright said. "It's also a lack of daylight."

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Still, Wyatt said, the biological effect was "very consistent" for all eight campers in this study which suggests that a similar effect would be seen in a larger group.

"We've already known that artificial light is keeping us up at night," said lead researcher Kenneth Wright, of the University of Colorado at Boulder. But this study, he said, was an attempt to "quantify" the effect that light exposure, both artificial and natural, may be having on the human body's internal "clocks."

"Reduce your exposure to light from the TV and computer at night," he said. "And during the day, get out more. Eat your breakfast outside, or go for a walk in the afternoon."

And, researchers found, even avowed night owls turn into early birds after a week of camping in the woods with no sources of artificial light including smartphones, computers and TVs.

Another sleep specialist agreed that the findings are not surprising, but added that they are potentially important.

small study suggests.

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For now, Wright suggested that if you're someone who typically stays up late and regrets it in the morning, it wouldn't hurt to dim the artificial lights and get more sunshine.

"So they became much more in sync with the natural world," Wright said.

By Amy NortonTHURSDAY, Aug. 1 (HealthDay News) Putting down your phone and living for a week with nothing but sunlight and campfires may bring your body clock in sync with nature's rhythms, a Foamposite Dark Neon Royal

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