Did you ever have a job interview, or maybe an exam, or some important appointment, maybe in the city, and you had to get up really early to make sure you could make it there on time? On that day, were you late? Did you miss your appointment/interview? I'm guessing that you made it there on time, probably even with a few minutes to spare.
It's the same with waking up early for spiritual practice. If you have the right motivation, you will do it without any difficulties. If you think there is no consequence, then you will ignore it and then wonder why all your efforts are not working. You'll come to a forum like this asking people for advice on how to wake up early, you will present all your excuses (exhausted at the end of the day, not enough hours sleep, etc.) But the question you should be asking yourself is, how come you made it on time for the interview (even in NYC traffic), and yet you can't seem to wake up on time for something infinitely more important?
The answer is quite simply that you don't value it. You actually value your sleep more than your pre-dawn spiritual practice.
The solution is to 1) understand the real value of your spiritual practice, 2) make a decision about what it means to you, and 3) place a greater amount of importance upon it than that job interview/appointment.
If you genuinely do the above, you won't need any tips & tricks, or elaborate ritual or advice from anyone. It will be, as if by magic, that you will rise early and perform your spiritual practice.
On a personal note: If you ask any lover, she will not hesitate to tell you that she will do anything and everything to spend every moment she can with her beloved. She is drenched with love, ready to forsake the entire world and everything she has, for just a moment with her lover. Reflect upon that next time you have any sort of reluctance to spend time in your spiritual practice.
[AoG]