Resetting Your Clock.
According to new research, camping in the wilderness for a week can synchronize our internal clocks to the solar day, allowing our bodies to normalize melatonin levels. On average, study participants went to bed and awoke two hours earlier when only exposed to sunlight and campfire light. All of the participants’ sleep patterns synchronized with sunset and sunrise, despite the fact that the study included both early birds and night owls.
Current Biology, August 2013