I literally have 3-4 alarms go off all at strategic points of my room. The first to go off is from my digital Quran and that is the azan right at beginning of Fajr. Then i have my phone alarm go off about 15 minutes later. And if i still am not up 10 minutes later, I have my mp3 player set to blast Quran (Surah At-Tawba- Shuraim) at the end of my room so i have to get up to reach it. This way I can efficiently wake up for Fajr.