Circadian Rhythms: Today a crewmember doffed the Circadian Rhythms hardware. This completes the 3rd session for this increment. Circadian Rhythms investigates the role of synchronized circadian rhythms, or the “biological clock,” and how it changes during long-duration spaceflight. Researchers hypothesize that a non-24-hour cycle of light and dark affects crewmembers’ circadian clocks. The ISS Experience: …