TEXT B What happens when human
beings are deprived of sleep for long periods of time To answer this question,
a New Yorker, Peter Tripp, offered to stay awake 200 hours. During that time
Tripp was observed by a group of doctors, who reported on his
progress. After three days of staying awake, he began to show
signs of mental breakdown. He laughed at things that were not funny, and wept at
things that were not sad. Complaining of pressure caused by a hat on his head,
he tried repeatedly to take it off. Tripp, of course, was not wearing a
hat. On the fifth day he cried out that a doctor’s jacket looked
like crawling worms. Then he imagined he was in another city; he tried to run
away from the building, insisting it was on fire; and he thought the 200-hour
mark had been passed but that doctors were "suffering from mental illness." He
was nearly mad! Barely able to stand, Tripp was helped
across the street to a room in a hotel. There, after being awake for 201 hours
and thirteen minutes, he fell asleep. The doctors predicted he would sleep for
twenty or thirty hours. "Peter Tripp will sleep in history. ’ said the doctors.
But he didn’t sleep that long, and his first words were, "I feel fine." After a
medical check, his greatly surprised watchers pronounced him fit. The next day
he was back to work. Tripp imagined all kinds of things ______.
A．when his third day of staying awake came to an end B．when he was deprived of sleep for 5 days C．at the end of the experiment D．after 201 hours and thirteen minutes without sleep