求翻译：　德国的研究者坎贝尔认为，睡眠周期是由大脑控制的，随着年龄的增长而发生某种变化；同时发现，午休是自然睡眠周期的一个部分。佛罗里达大学的一位睡眠研究专家说，午休已经逐渐演化成为人类自我保护的方式。最初，午休可能只是人们为了躲避正午的烈日，后来逐渐变成一种习惯；那时的人类是生活在暖热的地区，户外劳动是人们维持生存最基本的条件。因此午休成为人们避免遭受热浪袭击的方法。是什么意思？

Campbell German researchers believe that sleep cycle is controlled by the brain, with age and the occurrence of a change; also found that the lunch is a part of the natural sleep cycle. University of Florida, a sleep expert said lunch has gradually evolved into the way of human self-protection. Init

The researchers believe that Germany Campbell, sleep cycle is controlled by the brain, increases with age so that certain changes were found; at the same time, lunch is a part of the natural sleep cycle. University of Florida, a sleep study expert said that lunch has gradually evolved into a human o

　Germany's researcher Campbell believed that, the sleep cycle is controls by the cerebrum, has some kind of change along with the age growth; Also discovered that, the midday rest is a natural sleep cycle part.A Florida University's sleep studies the expert to say that, the midday rest already gradu

　Germany's researchers Campbell believed that sleep cycle is controlled by the brain, as she grew older and some changes have taken place; also found that the lunch break is a part of the natural sleep cycle. University of Florida, a sleep researcher says, lunch break has gradually evolve into a hum