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The Full Moon's Modest Impact on Sleep

Strategic Insights

— 2 min read

Research has long suggested that the full moon might disrupt our sleep and even drive us "mad." However, the science is more nuanced than folklore suggests. Studies show that a full moon can indeed affect sleep, but its influence on mental health is less certain. The likely reason is light exposure, which can delay our internal clock, reduce melatonin, and keep us more alert. The changes are modest, with most people losing only 15 to 30 minutes of sleep.

Key Takeaways:

  • A full moon can affect sleep, causing people to sleep about 20 minutes less, take longer to fall asleep, and spend less time in deep, restorative sleep.
  • The most likely reason for the full moon's impact on sleep is light exposure, which can delay the body's internal clock, reduce melatonin, and keep the brain more alert.
  • The changes in sleep patterns during a full moon are modest, with most people losing only 15 to 30 minutes of sleep.
  • People in rural areas or while camping are more likely to be affected by the full moon's impact on sleep due to reduced artificial light exposure.
  • Research suggests that men and women may be affected differently by the full moon, with men losing more sleep during the waxing phase and women experiencing less deep and restful sleep around the full moon.
  • Sleep loss from a bright moon is not a reliable trigger for psychiatric crises, but it can exacerbate pre-existing mental health conditions, especially for those with bipolar disorder, schizophrenia, or epilepsy.
  • Ongoing sleep disruption raises the risk of depression, suicidal thoughts, and flare-ups of conditions like bipolar disorder and schizophrenia.

Statistics:

  • People sleep about 20 minutes less in the days leading up to the full moon (http://doi.org.sdpl.idm.oclc.org/10.1016/j.cub.2013.06.029).
  • Most people lose only 15 to 30 minutes of sleep due to the full moon's impact (http://doi.org.sdpl.idm.oclc.org/10.1016/j.cub.2013.06.029).
  • A study found that psychiatric hospitals in India recorded more use of restraints during full moons, based on data collected between 2016 and 2017 (http://doi.org.sdpl.idm.oclc.org/10.1080/07420528.2020.1849253).
  • Research suggested a slight rise in schizophrenia admissions in China around the full moon, using hospital records from 2012 to 2017 (http://doi.org.sdpl.idm.oclc.org/10.1080/07420528.2019.1625054).

Sources:

  • http://doi.org.sdpl.idm.oclc.org/10.1016/j.cub.2013.06.029
  • http://doi.org.sdpl.idm.oclc.org/10.1016/j.sleep.2014.06.020
  • http://doi.org.sdpl.idm.oclc.org/10.1126/sciadv.abe0465
  • http://doi.org.sdpl.idm.oclc.org/10.1080/07420528.2021.1897609

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