I have heard mixed things about those wedges.
I am not sure if he is rolling and that is waking him or he is just waking because he is on the mattress! This JUST started ... before he was fine!
Now of course (an hour of trying to settle him) he is constantly hysterical.
I pick him up nad he's calm, put him down and he screams. I can make him sleep in my arms, but as soon as he touches the mattress he screams.