Rumors have been perpetuated that emergency rooms and jail cells are full during full moons due to increase in risky and violent behaviors. Is this just an urban legend or is there any merit of truth behind it.

  1. If there is some form of legitimacy to it, what is the medical (or geophysical) reason behind it?
  2. And if it's not true, why did human behavior become associated with the moon?
  3. Does the moon impact human behavior in any way? (Heard of menstrual cycles...)
  • Do you have valid sources for this rumours? Then this question might be a better fit ion Skeptics.SE – Arsak Mar 5 '17 at 12:44
  • already asked about crime there:skeptics.stackexchange.com/q/948/31357 (Spoiler: no increase in crime due to moon phase.) They have a moon tag, with 34 questions. – Kate Gregory Mar 5 '17 at 16:56

Our Moon affects tides and nighttime light levels. This may not seem like much, but the fluctuations of tides and nighttime light levels have both been very important to life on Earth since it began. It is probable that our internal body rhythms are in some way related to the cycles of our Moon, but I do not know exactly how, nor how strong that relationship is.

Menstrual cycles are sometimes approximately the same length as lunar cycles, but nowadays there is quite a bit of variation among women. I cannot describe a mechanism by which our Moon would control the female reproductive system, but it might have influenced its development far back in the evolutionary tree.

So, as a tentative answer to your question (mostly conjecture), it is possible that human behavior is somehow related to lunar cycles, but I believe the link between the two was forged millions of years ago, and is probably quite weak by now.

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  • I'm sorry, but this answer doesn't really answer the question... – Don_S Mar 5 '17 at 9:23

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