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Christian Cajochen, a sleep researcher at the Psychiatric Hospital of the University of Basel in Switzerland, led a study analyzing sleep study data measurements, including brain activity, of 33 individuals who had previously been assessed in a sleep clinic. To their surprise, Cajochen said researchers found the subjects slept more poorly when the moon was full. “Around [a] full moon, people had less deep sleep, about 30 percent less deep sleep. They slept in general 20 minutes shorter, and it took them five minutes longer to fall asleep,” he said.
Cajochen said little is known about the impact of moon phases on humans, whose sleep is influenced by a 24-hour internal clock called a circadian rhythm, a biological process driven by hormone fluctuations that control the sleep-wake cycle and feeding patterns. This internal clock also is affected by periods of light and dark, according to Cajochen, who said researchers found that levels of the hormone melatonin, which readies the body for sleep, also were lower in subjects during a full moon. “There is darkness outside and our body has to adapt to darkness behavior, which means in humans, sleep. So it’s a sleep-preparatory hormone. And this was reduced during full moon phase, although they didn’t see the light. And this probably causes or caused this little sleep disturbance,” he said.
A full moon is seen in the sky behind New York's Lower Manhattan skyline
Cajochen speculates the sleep disturbance, which is due to what he calls a “circalunar” rhythm, might be a holdover from prehistoric times, influencing human reproduction and other activities as it now does in animals including sea creatures. “There is evidence these two clocks talk to each other - the circadian and the circalunar clock in other species. But we don’t have any clue in humans, first of all, whether there is a clock, a circalunar clock, and if yes, where is the clock, you know where in the brain. We know it about the circadian clock, we know exactly about the location, where it is for the circadian clock, but the circalunar clock is still mysterious,” he said.
Cajochen said a lunar clock, if it exists, also may influence cognitive performance in humans and our moods. An article on the influence of the moon on human sleep is published in the journal Current Biology.
Study Links Poor Sleep to Full Moon
Interruptions in the circadian rhythm make it difficult for some individuals to sleep when they are supposed to do so. Shift workers and people who fly across different time zones are especially vulnerable. Sleep is frequently disrupted until the workers adjust to a late night schedule or travelers to the new time zone. Experts say the process can take days or weeks, causing fatigue, indigestion, and poor cognitive performance, in addition to sleep disruption.
An international team of British and American researchers identified the protein, SIK1, which is involved in the bodys response to daylight. About 100 genes are switched on, signaling it is time to wake up after a nights sleep. SIK1, however, can interfere with the bodys ability to adapt with that process. When researchers blocked the activity of SIK1 in a group of laboratory mice whose 24-hour clock was disrupted, the animals adjusted faster to changes in the light-dark cycle.
Scientists believe it now may be possible to develop a drug that helps shift workers and travelers recover sooner from disruptions of their circadian rhythms so they can get a good nights rest. An article on the body's 24-hour internal clock in published in the journal Cell.
Researchers ID Protein Linked to Circadian Rhythm