We received a 1 yr old hamster about 1 week ago, and he was very active. He got out of his cage one night and now sleeps a lot. He does not run like he used to when in his ball, and does not run between his cages like he did before (we have 2 cages connected).
He might have found a chemical or swallowed something while he was out. If you think so, check and see if there is a vet that will see hamsters in your area.
It also could be that he was active at first because of all the excitement of a new place, but now he has gotten used to his environment. Hamsters are nocturnal so most of his activity is at night when your family is asleep.
Don't worry...enjoy. Once your hamster has become an adult (after about a year), he/she has a few "wild" episodes, but basically settles down. I'm really enjoying mine now that the childhood stuff is over. He's much calmer, and less excited about things--perfectly healthy. Just more mature.
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