I haven't owned an alarm clock for probably 12years.. since before junior high. I always wake up within an hour before I wanted to. It became pointless to set an alarm. However I can't go back to sleep after waking up. If I tell myself to wake up at a certain time that's it. I have to stay up for several hours before I can try to sleep again. I can only go back to sleep if something I didn't plan wakes me up and I don't get out of bed.