Which of the following is Dr. David's opinion?A.People who think they are sleeping enough
Which of the following is Dr. David's opinion?
A.People who think they are sleeping enough are better off than those who don't.
B.Some people can remain vigorous with only 6.5 hours' sleep a night.
C.If they get 8.5 hours' sleep, people will be full of drive and ambition.
D.People's mental power suffers if they are in sleep deficit.