Nope not dead. Although I was fooled at first. I opened the door with flashlight in hand, and found him lying flat on his back, motionless. I wasn't exactly sure how to tell if he was dead, but I was pretty sure I wouldn't be able to tell from all the way across the room.
I leaned over and picked up his hand. As a note it was very cold and clammy, pretty much exactly what you would expect. Before I could drop his arm he started moving. Needless to say I didn't stick around long enough to see what he'd do next, but he did seem just as surprised as I did and just as caught off guard and confused. It wasn't really till after I locked the door again that I realized he was sleeping.
Zombies sleep, not exactly something I expected to find out.
And now, of course, he's awake and banging on the door again.