I have a 15 year old neutered male cat who is in good health. There are no signs of any health problems...he sees a vet a least once a year. He is on Azodyl(spelling?) to help with the kidney's since a few of his blood levels were slightly over normal and the vet decided to put him on it as a preventative measure. My problem is that he has started crying for no reason. It's not a cry of pain. He does it more in the middle of the night..though he does it during the day also. We will call out to him and he'll stop and come running to us. He seems to be looking for something when he does it. I know this is probably a common behavior but he just recently started doing it. It is not constant..most of the time he seems to be content and relaxed. There are three other cats in the house that have been here for years. Any suggestions on what the cause may be or a solution to my sleep deprivation!! I'm not as concerned about losing sleep as I am about making him comfortable. Thanks for any help.