When he wakes you up what do you do? Do you pet him, give him treats, play with him during the time you are up? If so, stop. Make it all about business (while being nice). Get up, take him out. Give a quick "good dog" when he potties, then go right back to bed. Sometimes the dogs wake us up because they know they'll get a cookie for going out or that you'll pet them.
If you think he may be doing it for a cookie, give him a small snack before bed to see if that helps.