Does anyone else's doxie do this?

So meet Winston. My long haired choco based cream miniature. He's 12.5.weeks, we've had him for almost 4 weeks now. Every time he is really tired or in a deep sleep, his tongue pops out. It's so bloody adorable!! I've not seen any other doxie nor dog do this.

P.s., and tips on training - toilet (he's great in the front room going towards the door. But in the kitchen, he just forgets!) - separation. He cries if I leave him! I work from home, but I have appointments and the gym to go too. - biting. Because OW. - General training,. Leave, off, come. I've tried but he's only motivated when I have chicken, which he may actually be intolerant too.