I've tried this, but it didn't work. I was able to wake early for about 3 days then I still went late to bed and my schedule became a mess again. This has happened to me a lot of times: no matter how tired I am, somehow I still manage to go late to bed. Or if I go too early (at 11-12 PM), I wake way too early at 4 or 5 AM which is impractical. In the afternoon I'll become very sleepy and transform into a zombie :-)