Brett Favre says the sack that ended his NFL career was the first time he was knocked out cold on a football field.

The Minnesota Vikings were playing the Chicago Bears on Monday Night Football and the quarterback had trouble remembering what team he was on.

"My last play, actually the only time in my career when I was completely out. Ten to 15 seconds," Favre said. "Miserable night, the dome had collapsed, our season had gone from bad to worse. I didn't have to play in the game, wanted to. I remember telling myself in pregame, 'You're an idiot. What do you stand to gain in this?' But I thought, 'I'll survive this game, I'll be fine.'

"(It was) one of the most minor hits I've ever (taken). The guy didn't even hit me, he pushed me. I threw the ball, and the field of course was solid ice, it was like concrete. He pushed me, I slip, fall, nothing hurt, I hit the left side of my head, and the next thing I remember, I was snoring as our trainer is kind of shaking me, saying, 'Are you OK?' I look at the footage, even though it wasn't long, there was that 10-, 15-second period where I was asleep.

"I remember looking at our trainer, Suge (Eric Sugarman), and saying, 'Suge, what are the Bears doing here?' He's like, 'Ah, you come over here with me, buddy.' As I started figuring it out as I was getting to the sidelines, I thought, 'Now, if there was ever a time where the writing is on the wall, this is it.'"