The Economic Times

On the ISS, astronauts see 16 sunrises every day as the station circles Earth, but their bodies refuse to follow the 90-minute cycle, forcing crews to stick to a familiar 24-hour routine despite living through multiple days and nights

Astronauts on the International Space Station experience sixteen sunrises daily. They follow a strict twenty-four-hour schedule, ignoring the rapid orbital cycles. Internal body clocks can mismatch with the external environment, affecting sleep patterns. Artificial lighting helps regulate astronauts' sleep and wakefulness cycles.