The key to being able to wake up early is unfortunately the worst advice ever but it totally works. You need to wake up at the same time every day. Like EVERY day. Not mon through fri, I mean 7 days a week no exceptions. It SUCKS in the beginning but it's the key to getting better sleep. It's the key to waking up early, especially if your body is really resisting it, which it sounds like yours is. Start a morning routine. Include something you enjoy, cup of hot chocolate? Listening to a podcast you love? Include 10 extra minutes to read a book/do some yoga/ anything you enjoy? Routine, routine routine is the key to better sleep and better moods. Unfortunately. I hate that it's true but it is!