I do this. I set one alarm for an hour before I'm meant to be up (I usually don't remember this), one half an hour before, one on the actual time and then in sm

I do this. I set one alarm for an hour before I'm meant to be up (I usually don't remember this), one half an hour before, one on the actual time and then in smaller and smaller increments until I'm so annoyed with turning it off that I just get up.