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.
So if you're asleep taking a nap at 2 p.m., it's going to take you much longer period of time to fall asleep. 2. Give Yourself A 30-Minute Limit. Short naps should generally last around 25-30 minutes, says Breus. That amount of time allows you to rest without the risk of entering into deep sleep and waking up feeling even more tired.