We adopted Loki just before he turned 7, he is 8 now and ever since we adopted him he has chewed on certain types of plastic like shower curtains, storage bags, ect. Anything that is a thick kind of plastic. It is really annoying, he chewed up my space saver bags so they can't seal any longer, the bottom of my shower curtains are a mangled mess and he always does it at night when I can hear the loud obnoxious sound of crunching plastic. He doesn't eat it, he just chews on it, if he manages to gnaw off a piece he spits it out and starts chewing on another part. None of my other cats have ever done this. Why would he be doing it? I leave the bathroom door open with the light on for my children though my storage bags are out of his reach now. I'm not sure how to discourage it in a good way because it normally happens around 3am when I'm not in the most patient of moods. Normally I yell at him to stop and he does for a little while before starting again. I try to remember to tie the curtain up out of his reach but I forget a lot. Is there some reason he is doing it? Is there a toy I can get him that will replace this need to chew on plastic? Or is there a way I can get him to make him stop without losing sleep, like a way to discourage it while I'm sleeping. I love the old man but I REALLY don't want to get up at 3am every night to lovingly tell him cut it out.