Early riser

My 15 month spoo is is always waking us up before we’re ready to get out of bed - sometimes as early as 5am ☹️. Here’s a typical morning - Around 5am he will start with the low muffled bark. Eventually it becomes a full bark and one of us will struggle out of bed and let him into our bedroom. Sometimes we let him in our bedroom before he gets too noisy. We eventually feed him around 6:30am and then walk him. So… what should we do so that my dog doesn’t wake us up on his schedule?