An ordinary alarm clock can definitely wake people up, unless you don't want to get up. I'll give you a solution. I take one tablet every minute from five o'clock to wake myself up. If not, I'll find a human alarm clock, such as boyfriend, girlfriend and roommate. It seems that my roommates are unreliable, so tell my mother so that I can definitely get up. A better way is to stay up until five o'clock, so you don't have to get up or even sleep.