In one study, 8 volunteers reduced their sleep by 30 minutes per night until they did not want to reduce it further. A major finding was that
A) 4 managed to reduce their sleep to 5 hours per night.
B) 2 managed to reduce their sleep to 4.5 hours per night.
C) the volunteers began to experience significant daytime sleepiness once they had reduced their sleep to 6 hours or less per night.
D) the volunteers were still sleeping between 7 and 18 hours less per week when they were tested 1 year after the experiment ended.
E) all of the above
Question 2
In a large, well conducted comparison between long sleepers and short sleepers, Fichten and colleagues found that the short sleepers
A) slept less.
B) suffered from more mental illness.
C) had poorer memories.
D) had shorter life expectancies.
E) both A and C
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