Payloads Actiwatch Plus: A crewmember connected Actiwatch units to the Human Research Facility (HRF)-2 rack to allow ground teams to downlink data. The Actiwatch is a waterproof, nonintrusive, sleep-wake activity monitor worn on the wrist of a crewmember. The device contains a miniature uniaxial accelerometer that produces a signal as the subject moves. The data …