Welcome Dardel!
I have had my Toby for 4 weeks now and when I first brought him home he was soo excited at the new surroundings he played and played and played until he just dropped. He was like for the first 3 days and then he started sleeping A LOT! and i was worried so I took him to the vet thinking something was wrong with him because he wouldn't eat and I couldn't hardly wake him up. But the vet told me he was ok... he had just wasted soo much energy playing with his new family he plumb wore himself out and that he was a growing pup and need lots of sleep and that he would go threw phases like this. The vet just told me to wake him every couple hours. Also, he told me that sometimes puppies will forget to eat because they are soo excited about their new homes so you pretty much have to force feed them a few bites then they should perk up and eat.
*Another thing he told me was that to give them more energy when they are down is to put a tsp of honey in 4 oz of water.
Hope this helps and congrats on your new furbaby
