If external time markers,such as clocks or light and darkness,are removed,the human sleep-wake cycle will
A) become slightly shorter.
B) become slightly longer.
C) remain exactly the same.
D) be unpredictable.

Question

Quizplus · Accepted Answer

When external time markers are removed, the sleep-wake cycle tends to become slightly longer because the natural circadian rhythms are no longer being entrained to a 24-hour cycle. Without external cues, the body may naturally want to adhere to a slightly longer cycle, such as 25 or 26 hours. This phenomenon is known as free-running sleep.

If External Time Markers,such as Clocks or Light and Darkness,are