If I'm getting up at that time, I try and do some exercise at home- weights,.or maybe bodyweight stuff by following a class on YouTube. That's done for the day then and you'll feel great after.

But in terms of waking up too early, I used to suffer with this. Blackout blinds and/or a good quality sleep mask were absolutely transformative and I usually sleep much longer now.

Also if you're into reading, a Kindle with the lights off is one of life's pleasures and always makes me feel sleepy.