Yes, buiding a habit takes some time, but 3 weeks will be definitely enough for
building basic early wake up habit. We don't feel comfortable committing to waking up
early on every day till the end of your life. It's kind of commitment which is extremely hard
to give! What you need to do is commit yourself to wake up early for 3 weeks. That's all. You know that on
22nd day you may sleep for as long as you want. Guess what? After 3 weeks, you will not want
to sleep any longer!
Once you make it a habit, it's easy to follow. It's easy because you know you
don't have a lifetime commitment and you can break it should you feel like it. It works great with
previous tip - give a promise to someone you're going to get up at 6am for next 3 weeks. Even
if you decide it's not something you'd like to do for a long time, you still can manage to do it for 3 weeks.
But the best thing about making it a habit is that you will be able to wake up without an alarm clock...