grinding through tray

Hi all, I 'finished' treatment a few months ago and now have to wear the trays at night for the rest of my life... it's only been a couple of months and I've already ground through a couple of the 'teeth' and put holes in the tray... aside from learning to relax more, is there anything I can do? I was hoping not to have to get one of those intense hockey-player retainers, they're so hard to sleep in!