填空题

American society is not nap-friendly. In fact, says David Dinges, a sleep (36)__________at the University of Pennsylvania School of Medicine, "There’’s even a (37)__________against admitting we need sleep." Nobody wants to be caught napping or found asleep at work. To quote a proverb: "Some sleep five hours, nature requires seven, laziness nine and (38)__________eleven." The way not to fall asleep at work is to take naps when you need them. "We have to totally change our (39)__________toward napping," says Dr. William Dement of Stanford University, the (40)__________of sleep research. Last year a national commission led by Dement (41)__________an "American sleep debt" which one member said was as important as the national debt. The commission was (42)__________about the dangers of sleepiness: People causing (43)__________accidents or falling asleep while driving. This may be why we have a new sleep policy in the White House. According to recent reports, the President is trying to take a half-hour nap every afternoon. (44)______________________________. We seem to have "a mid-afternoon quiet phase", also called "a secondary sleep gate". (45) ____________________________. Clearly, we were born to nap. We "snack" on sleep, whenever, wherever and at whatever time we feel like it. (46)____________________________.