Personal tips on how to get a good night sleep and wake up early

There are probably tons of tips out there, but I'm more interested in what tips you guys have. It may be different from person to person, but I still want to hear them and what works. I have discovered that going to bed early doesn't necessary mean that you will wake up early the next morning. There have been several times where I woke up way too late for work because I went to bed early.

My tip:
Sleeping with your window open makes you wake earlier. I think it's because your body sense the cold environment.

Jam it back in, in the dark.