To determine sleep needs, researchers sometimes conduct a survey study, comparing the hours of sleep reported by patients to
A) the median age of the patient population.
B) the age at which patients die.
C) mitigating factors such as stress and medications.
D) occupational and activity requirements of patients.
Cited studies in the text show that a moderate increase in sleep duration improves
A) alertness.
B) task-based performance.
C) mood.
D) All of the answers are correct.
Americans of college age (19 to 29) typically
A) get more sleep than the average American adult.
B) get less sleep than the average American adult.
C) get an equitable amount of sleep compared to the average American adult.
D) None of the answers is correct. There are no generalizations for this age group regarding sleep patterns.
During weeknights, studies show that one in every ________ American adults experiences very short sleep, defined as less than 6 hours.
A) ten
B) five
C) eight
D) two
A national poll conducted in 2009 found that ________ of American adults experience short sleep every night of the week.
A) 25 percent
B) 30 percent
C) 45 percent
D) 50 percent
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