Ever since high school, I've always had the problem of going to sleep and sleeping too deeply, and being unable to wake up with my alarm even when I set 2 of them and put them on opposite sides of my bedroom. Normally I don't remember my dreams at all, nor do I remember the alarms going off. Right now, I work night shift, which is something I neither can't or want to give up, it's a great job at a hotel where I do night sudit, so it gives me a great opportunity to advance in my career field once I finish my education. I also took a 2nd job waitressing(just dinners, so I didn't think it would disrupt my sleep schedule too much) so I could save money between now and when I return to college, which I was fired from very quickly because I kept oversleeping despite setting 2 alarms, often now even if I go to sleep at 10 am and set my alarm for 5:30 pm I still don't wake up untill 8 pm or so!

I'm wondering what could be causing this, in any case I need to become a lighter sleeper who can function off of 6 hours sleep, as I start college again in 2 months and if I got fired from the waitressing job, I certainly don't want to end up flunking out of college or worse, being fired from my hotel job, because of oversleeping. How do I do this? And thanks.