Figure 1From: Keeping the right time in space: importance of circadian clock and sleep for physiology and performance of astronautsNetwork diagram of the circadian clock, sleep, physiology and behavior in space. In space, a variety of environmental factors are involved in the regulation of the circadian clock and sleep. The circadian clock and sleep regulate each other. The alignment of the circadian clock and sleep is critical for physiology, behavior and performance. In turn, behavior and performance can feed back to affect the circadian clock and sleep.Back to article page