A. Cats and kittens are known to sleep a lot. It is difficult especially with a young kitten to know what is normal. But if he is sleeping more than usual then it may be a problem. Excessive salivation can be a sign of something abnormal in the mouth like a bad tooth or sometimes something is stuck in the roof of the mouth. Excessive salivation may also be related to nausea, so if he has been vomiting or not eating that could be the reason. Also, rarely this can be related to a liver issue. The bottom line is you will need to get him checked out by a veterinarian as soon as you can make an appointment.
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