> Before around 2010 – when LED lighting and smartphone use became widespread – many women’s menstrual cycles tended to begin around the full Moon or new Moon phases. Afterwards, that synchrony largely vanished, persisting only in January, when the Moon-Sun-Earth gravitational effects are strongest.[0]

Usually I just pass by the refs but this time I felt moved to read.

[0] https://www.tandfonline.com/doi/abs/10.1080/09291016.2013.83...