What is the main idea of the passage?
A.
There is little danger of serious after-effects when human beings are deprived of sleep for long periods of time.
B.
Going without sleep for a long period will cause bad shortlivede ffects, but apparently no serious after-effects.
C.
After 200 hours without sleep Tripp was suffering from 'mental ill ness'.
D.
The doctors predicted Tripp would sleep for twenty or thirty hours.