More than a few alarm clocks are harmful to people, such as people are repeatedly awakened, in the long run, will lead to daytime sleepiness, sleep disturbances, may lead to chronic fatigue. According to research, people are repeatedly waking up after the human body adenosine content will increase, and adenosine is one of the important neuromodulators regulating sleep, adenosine content increases, the more awake, and the longer awake, the higher the degree of sleepiness. Setting more alarm clocks, in the case of people are not particularly awake, may again enter a deep sleep, often this will disturb the human biological clock, and intermittent sleep will also make people often groggy mind. In general, it is not recommended to set more alarm clocks, if it is difficult to get up, you can put the alarm clock a little farther away, the alarm clock to force themselves to get up, or to improve the individual’s biological clock, go to bed early and get up early, get enough sleep, but also easy to get up early.