If you want to wake up earlier, then make sure you have something important planned for the morning – something that you really want to do first thing as you get up, and something more important than taking an extra hour of sleep.
Having something important planned for the morning can be that pushing force that will make you get up. Things that you really enjoy doing work best, but sometimes the things that are really pressing on you work just as well. The key is to have strong reasons to get up early in the morning.
Check what important tasks you have planned for the upcoming days and schedule some of them for the next morning. Perhaps you have a hobby that you can’t find the time for lately, or some coursework that you have been putting off. The more important something is for you, the higher the chances are that it will push you out of bed.
We often have some important or extremely interesting things that we couldn’t do during the day, so we try to do or finish them in the evening. A good tactic that I want to recommend is to postpone it until the morning. For example, you need to answer that important email from your boss. It doesn’t really matter if you do it at 11 pm or 6 am next day – your boss will see it only in the morning. But knowing you have to do it before he writes you his another “reminder” email will make you stand up and go to computer as soon as the alarm goes off.
Another example is when I find a good book and keep reading it until midnight because it’s so interesting I just can’t stop. What I usually do then is I stop reading at some interesting point (yes, you need will-power to do it!) and put the book near my bed. Then, instead of spending another hour late in the evening I wake up to read the book one hour early in the morning. It’s not an absolutely “important thing” to do, but curiosity definitely works here just as well.