Today, you’ll learn about how microgravity affects sleep and physiological rhythms, the half a billion year old bioluminescent octocoral, and the truth about women’s synchronized menstrual cycles.    Microgravity Effects    “Simulated microgravity affects sleep and physiological rhythms.” EurekAlert! 2024.  “Effect of 60 days of head down tilt bed rest on amplitude and phase of rhythms in physiology and sleep in men.” by Maria-Angeles Bonmati-Carrion, et al. 2024.    Octocorals    “Glowing octocorals have been around for at least 540 million years.” by Jake Buehler. 2024.  “What is bioluminescence?” NOAA. N.D.  “Evolution of bioluminescence in Anthozoa with emphasis on Octocorallia.” by Danielle M. DeLeo, et al. 2024.    Menstrual Sync    “Do women who live together get their periods together, or is it a myth?” by Marlene Cimons. 2024.  “Women do not synchronize their menstrual cycles.” by Zhengwei Yang & Jeffrey C Schank. 2006.  “Menstrual synchrony: Fact or artifact?” by Anna Ziomkiewicz. 2026.    Follow Curiosity Daily on your favorite podcast app to get smarter with Calli and Nate — for free! Still curious? Get exclusive science shows, nature documentaries, and more real-life entertainment on discovery+! Go to https://discoveryplus.com/curiosity to start your 7-day free trial. discovery+ is currently only available for US subscribers.  Hosted on Acast. See acast.com/privacy for more information.