LPT: If you keep sleeping through your alarm, change the alarm sound every month or two if you can. It'll keep you from getting used to hearing it and sleeping through it.

I use my phone as an alarm clock most of the time and I would always sleep through it. I found out that changing the sound for the alarm would stop me from sleeping through it all the time. After awhile it would just feel like background noise that I'd sleep through instead of something that's supposed to wake me up.