37. Which sentence best expresses the central point (main idea) of the passage?
(A) Naps of an hour or so after the midday meal were once popular and are still in favor in LatinAmerican and European countries.
(B) Naps, generally short ones about eight hours after waking, energize people mentally andphysically.
(C) According to sleep researchers, the human body is programmed to become sleepy in theearly afternoon.
(D) There are two types of naps: short ones that energize body and brain and long ones thatmake up for great sleep loss.