Rose, you really need to get him to a vet as soon as possible...cats can get sick very fast...at the shelter the little ones often get "colds" and the vets give them meds for it...so it could be just a small infection or upper respiratory irritation...but only a vet can tell you for sure.

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"Cats are rather delicate creatures and can have many ailments, but I've never heard of one with insomnia." Joseph Wood Krutch