PhotoThere have been countless “cures” proposed for those who have trouble sleeping. A cursory internet search will suggest anything from sipping warm milk to taking melatonin supplements. However, researchers from the University of Colorado Boulder have a much more recreational answer: go camping for a weekend.

Doctor Kenneth Wright, an integrative physiology professor and lead author of a paper covering two studies, explains how going camping in an environment with natural light and dark cycles can reverse the damage of living everyday life in an artificially lit environment.

"These studies suggest that our internal clock responds strongly and quite rapidly to the natural light-dark cycle. . . Living in our modern environments can significantly delay our circadian timing and late circadian timing is associated with many health consequences. But as little as a weekend camping trip can reset it," he said.

Managing our internal clocks

This is not the first paper that Wright has published on the beneficial effects of camping. In 2013, he conducted a study where participants were sent to camp for a week in the summer without the use of headlamps or flashlights at night. When they returned, Wright found that their levels of melatonin – a hormone that prepares the body for nighttime and promotes sleep – had synced with sunrise and sunset, a change of almost two hours.

To build on that previous study, Wright set out to find how quickly our internal clocks could change based on the lighting of our environment and the time of the year. The first study consisted of 14 participants – nine of which were asked to camp for a weekend during the summer while the other five stayed home. After the weekend, participants who went camping had melatonin rise 1.4 hours earlier than those who hadn’t gone, suggesting that their internal clocks had altered.

In the second study, five participants camped for an entire week around the time of the winter solstice. Statistics showed that they were exposed to 13 times more natural light than usual and that their melatonin levels began to rise 2.6 hours earlier.

"Weekend exposure to natural light was sufficient to achieve 69 percent of the shift in circadian timing we previously reported after a week's exposure to natural light," Wright stated.

Getting back in sync

So, what does all of this mean for sleep? Essentially, the two studies showed that not being exposed to artificial light allowed participants’ bodies to alter according to the time of the year and their bodies’ natural needs.

When living life normally with artificial light, the body’s internal clock and natural rhythms are often thrown off, which can impact when hormones are released, when we sleep and wake up, and even our appetite and metabolism. However, the studies show that just one weekend of camping away from that environment is enough to put our bodies back in sync. Wright hopes the results will help guide building and city design to help encourage natural light to promote health.

"Our findings highlight an opportunity for architectural design to bring more natural sunlight into the modern built environment and to work with lighting companies to incorporate tunable lighting that could change across the day and night to enhance performance, health and well-being," he said.

The full study has been published in Current Biology.


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