In experiments where participants were allowed to sleep for an unlimited amount of time, participants tended to sleep 12 or more hours a day for the first few days and then settled into 7.5 to 9 hours of sleep a day. The extra-long sleep time of the first few days suggests that participants began these experiments with .

Sleep debt

Step-by-step explanation:

Also called sleep deficit, sleep debt can be likened to a deficit in the bank such as a loan that must be repaid. The deficit accumulates and will have to balanced or there would be mental or psychological effect on the affected person. Research by The national sleep foundation requires Americans to sleep at least 7.1 hours per day.

There two types of sleep deprivation or sleep deficit: partial sleep deprivation and total sleep deprivation. In Partial sleep deprivation, the person may not get enough sleep per day example not up to 7.1 hours per day. Total sleep deprivation means that the affected person does not sleep for up 24 hours ie a full day.

the answer is c: divide the arc's degree measure by 360°, then multiply by the circumference of the circle.

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step-by-step explanation: