Oh boy, I am not sure
I suggest this though. I would buy an X-Pen - Walmart has them for $50
http://www.walmart.com/catalog/produ...uct_id=1762412
I would set this up for him at night, with pee pads, his bed, his crate (but leave the crate open) - so that he is able to get up and over to the pee pad to do potty.
See if that works, b/c he obiviously has to go potty in the middle of the night and he just can not hold it.
Another suggestion would be to wake up in the middle of the night and take him out to do potty, hopefully you will get him out of his crate before he does it in the crate.
Best of Luck!