Shake Clock is a very interesting app. When you use it, you absolutely can not rely on to stop it by the alarm button, you can stop the alarm only shake it, when you finishe shake, you're Already wake up.After you have Shake Clock, you no longer have to sleep late .Open the application, you can choose to add the voice sounded the alarm, you can also set the intensity and frequency of shaking, if you are a man that return to sleep, then you'd better tune is the most vigorous and most times.