HeeHee! I get to use wrist cuffs either clipped behind my back, or overhead to the headboard every night, and after a particularly rough scene, (when I need more 'physical' contact aka. 'security' for psychological reasons!) I also get ankle cuffs added that are tied to the footboard. Whatever marks there are, seem to be no different than the kind you get from sleeping in clothes, or on a wrinkled sheet. I don't think I would get any sleep, though, with a gag on.