I don't require an alarm clock, I wake up at the same time nearly every day, infact now spring is here I am waking earlier due to the light, 6am, is a bit too early for me, but tell my darn body that, I guess if I were going out to work, I would prefer to have a back up system like an alarm clock, just incase my very reliable body alarm dared to let me down even once,(sometimes I really wish it would) like a sleep in to 8 am weekends would be heaven.