That said, I made the switch from night owl to morning person. Like many lifestyle changes, I think the biggest part is establishing the habit, after which it becomes your standard existence. Create a regular pattern.
Take a moment to understand what behaviors keep you up at night and change the time you engage in those habits. I used to drink coffee even in the evenings, now I don't have caffeine after noon. Eliminating screens, both because of the engagement and the light, can help. I haven't used it, but many people I know swear by melatonin for correcting sleep schedules when traveling, and it may help you through an adjustment period.
Regular exercise, in addition to being a generally good thing for you, can also help ensure your body wants rest at the end of the day. There were some great tips in the replies, camping / backpacking does tend to force the issue of being a morning person. I also don't use an alarm clock for a few reasons, but I think alarm clocks enable staying-up too late... you're less inclined to worry about when you get to sleep if you know something will wake you up.
Finally, I sometimes have a problem getting to sleep when too many thoughts are racing through my head. I find listening to podcasts is a huge help, but it has to be a topic that is interesting enough for me to ignore everything I was thinking, but not so interesting that I am engaged enough to stay awake.