In an unchanging environment,such as a cave or a submarine,you continue alternating between wakefulness and sleepiness on about a 24-hour schedule.

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Our bodies have evolved to operate on a 24-hour circadian rhythm, which is regulated by light exposure and other cues from the environment. Even in a constant environment without external time cues, our internal clock will continue to regulate our sleep-wake cycle on approximately a 24-hour schedule. This phenomenon has been demonstrated in studies conducted in caves and other controlled environments.

In an Unchanging Environment,such as a Cave or a Submarine,you