private static int generateSleepTime(){
		int sleepTime = 1;
		Calendar c = Calendar.getInstance();
		int hour = c.get(Calendar.HOUR_OF_DAY);
		if(2<=hour&&hour<=7){
			//賿2㵽7 2040һ
			sleepTime = (20+(int)(Math.random()*20));
		}else if(8<=hour&&hour<=17){
			// 1020һ
			sleepTime = (10+(int)(Math.random()*10));
		}else if(18<=hour&&hour<=19){
			//㵽˵㣬嵽ʮһ
			sleepTime = (5+(int)(Math.random()*5));
		}else if(20<=hour&&hour<=23){
			//8㵽12㣬ÿһһ
			sleepTime = (1+(int)(Math.random()*2));
		}else if(hour==24||hour==0||hour==1){
			//賿0㵽һ㣬嵽ʮһ
			sleepTime = (5+(int)(Math.random()*15));
		}
		return sleepTime;
	}