Make sure you don't have a outside night time visitors that are causing you're cat to be upset. I had to invest in a sprinkler called "The Scarecrow" which is motion activated and works day or night and gives of a 3 seconds water blast to help get rid of nightime visitors to my property. My cat was going crazy in the windows and howling too and then we spotted why with a male visitor outside. Best price was at Froogle.com.

Good Luck
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Cheri,Shelby,Lily & Lucy

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