Notes on napping

摘要

GIRAFFES do it for less than two hours a day, while pythons notch up 18 hours. Margaret Thatcher slept for only four hours a night. Thomas Edison declared sleeping a waste of time. While Edison was obviously wrong, the exact amount of sleep that humans need is the subject of much debate. Jim Home, former director of the Loughborough Sleep Institute, summed it up succinctly: "The amount of sleep we require is what we need not to be sleepy in the daytime."