I'd reluctantly call down... there's a chance he has 88, there's an outside chance he's overplaying the hell out of AJ or a (nut) flush draw w/ AK diamonds if the A was the non-diamond.... I just have a problem having a strong enough read on a guy who's asleep to lay down a set of J's here.... if you have an unbelievable read on the guy and have played with him many times, then fold it, but otherwise I call