Participants averaged 12 or more hours of sleep a day for the first few days of unrestricted sleep experiments. They then settled back to 7.5 to 9 hours of sleep a day. The unusually lengthy sleep time of the first few days suggests that participants began these experiments with a

Question

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The unusually lengthy sleep time of the first few days suggests that participants began these experiments with a sleep debt, which is the cumulative effect of not getting enough sleep.

Participants Averaged 12 or More Hours of Sleep a Day