he is beautiful, iv'e just got a puppy on Friday and experiencing exactly the same thing as you. puppies needs loads of sleep and you should let them do just that, it doesn't matter if they miss the odd meal or two. the fact that he is sleeping more now means he is becoming more relaxed in his new home and he feels safe and able to act like the tiny puppy he is. so you must be doing a great job and he settling in well!