The cycles of the moon have both regulatory and disruptive effects on the human organism, specifically influencing cardiac function, hormonal drip, organ clocks, fluid balancing, moods, mental health, metabolism, sleep patterns, and more. There are thousands of studies that confirm lunar influences ...
As an example, a study published in the International Journal of Biometeorology (Chakraborty 2013) regarding heart rate and blood pressure in different phases of the moon determined that the gravitation pull of the moon throughout the shifting phases has a measurable effect on cardiovascular systems.
...and another: Human Responses to the Geophysical Daily, Annual and Lunar Cycles
http://www.cell.com/current-biology/fulltext/S0960-9822(08)00865-8?_returnURL=http%3A%2F%2Flinkinghub.elsevier.com%2Fretrieve%2Fpii%2FS0960982208008658%3Fshowall%3Dtrue&cc=y=
...and another: Evidence that the Lunar Cycle Influences Human Sleep
http://www.chronobiology.ch/wp-content/uploads/publications/cajochen_2013-06.pdf
[ for more studies, google "lunar biological effects .pdf .edu" and "chronobiology lunar .pdf .edu ]
In my experience, having worked in nightclubs, hospitals, and schools ... the cycles of the moon can have a multitude of effects on humans. As a night club manager, I scheduled extra staff and security for the two weeks during which the moon waxes and less staff during the waning two weeks. I also managed inventor in the same way. As a grad student in clinical psych I interned in residential treatment facilities and hospitals and saw first hand how admissions and episodes increased during both the week of the full moon and the week of the dark moon. And as an college level educator, I witnessed class attendance, attention levels, and participation all increase and decrease in synch with the waxing and waning cycles of the moon.