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When Human Subjects Are Shut Off from the World So

Question 20

Multiple Choice

When human subjects are shut off from the world so that they cannot tell what time it is, or if it is day or night, light or dark, what happens to their sleep-waking cycle?


A) The sleep-waking cycle stays at about 24 hours.
B) The sleep-waking cycle is shortened to an average of 20 hours.
C) The sleep-waking cycle is lengthened to an average of about 25 hours.
D) The sleep-waking cycle becomes somewhat unpredictable.

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