Not sure what you're talking about but the powermat requires you to put a case on your phone for it to charge wirelessly on the mat. I'm almost positive that the powermat case for your phone will not fit inside another case. You'll have to take yours off and put on the powermat case at least while it's charging. When it's done then you can switch them back if you like yours better.
My GS3 sleeps in the bed and I make my girlfriend sleep on the couch