welcome to YT! Have you spoken to your vet about how much he is sleeping? I would want to rule out anything medically. Puppies sleep a lot, but it is also normal to be full of energy.
What type of toys have you bought? Small plush squeaker toys can catch their attn. or very small balls that they can actual pick up. Also, teething toys for a young pup can be helpful.
The other thing is to play, they love you to be at their level- laying on the floor is great |