It’s not so difficult, but it will take some change in your thinking. It seems right now – based solely on the dearth of information you have provided us (such as how much sleep you’re getting, for example, or why you want to get up at a particular time of the morning) – that you have “Get up at 7 AM” as a goal. Goal-setting is probably not the best way to achieve what you want. What you need is a system of sleeping that puts you to bed at a reasonable hour so that you can get “sufficient” sleep – however much that is – and then arise to begin a healthy and productive day.