Hi, Nina! OK, here's my take on this. I'm presuming pooch isn't in your room at night...
I think something is disturbing the little tyke, most likely light mornings. So, a bit of re-training is required. Is he barking, whimpering or generally making a nuisance of himself when he wakes? If so, I'd stand it as long as poss and then see what all the commotion is about. If it's nothing, then a stern word, back on his bed and leave him till you normally get up. Repeat as necessary until he's quiet. Some determination will be required, which won't be too difficult as you'll be in a grumpy mood anyway! He has to know you mean business. If he's not being a pain when he wakes, I'd leave him as long as you can increasing the time until you normally get up. Presumably, this is what you did previously and why you've never had any problems before.