On returning to England, Darwin and an ornithologist associate identified 13 species of finches that he had collected on the GalÃ¡pagos Islands. This was puzzling since he knew of only one species of this bird on the mainland of South America, nearly 600 miles to the east, where they had all presumably originated.
To get the most out of a nap, follow these tips: 1  Keep naps short. 2  Aim to nap for only 10 to 30 minutes. 3  The longer you nap, the more likely you are to feel groggy afterward. 4  Take naps in the afternoon.
Different length naps have various effects on your abilities when you wake up. The benefits of a brief nap â somewhere between just five and 15 minutes â can almost immediately give you a quick âpick-me-up.â But this sort of short nap is thought to have benefits for a limited period, about one to three hours.