Suppose astronauts are on a flight to another planet. The temperature and lighting of the spacecraft remain constant at all times. When will the astronauts become sleepy?

Question

Quizplus · Accepted Answer

The sleep-wake cycle of humans is regulated by a circadian rhythm that is approximately 24-25 hours long. Therefore, the astronauts are likely to become sleepy about once every 24-25 hours, regardless of the constant temperature and lighting of the spacecraft.

Suppose Astronauts Are on a Flight to Another Planet