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The fact that is is eating and drinking is a good sign, as is the fact that he is not limping. it may just be that he is very tired from running around energetically all day but in order to make sure i'd like to ask a few questions first.
What kind of puppy is he?
Can you look at his gums and see what color they are?
Did he eat his normal amount of food?
Did he vomit?
When he sleeps can you wake him up and is he normal once you wake him up?
Pink gum color tells me that he is able to get oxygen to his body which is a good thing. A normal appetite and no vomiting is also a good thing and that makes me less concerned that his blood sugar is low (common among young small and toy breeds). Since you are able to rouse him and he is normal when you do so, he is less likely to have a significant internal injury as well.
He is probably just worn out, poor little guy had an eventful day. He should be back to his playful self tomorrow but if he is not then he should be examined by a veterinarian.
Puppies, just like human babies need lots of sleep to grow and recover from periods of activity. Loss of appetite or prolonged periods of lethargy and sleepiness (a majority of the day or an inability to be roused) may indicate that your puppy is ill and should be examined but keep in mind that he does need several hours of uninterrupted sleep to be able to recharge his batteries.
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