Williams is one of four players listed on this week's injury report, but the other three - wide receivers Stevie Johnson and Robert Woods, as well as cornerback Nickell Robey - all practiced in full on Friday and are listed as probable for Sunday's matchup with the Atlanta Falcons.
"It was a lot of fun this morning. I think I woke up everybody in my house," Williams told reporters Friday. "I don't know how to describe it. It's just something that happened. I guess I just slept on it funny and then jumped up too fast. I don't know how it happened."
Williams also told reporters that he plans on playing, but head coach Doug Marrone listed him as questionable in the event that the tricky back issue can't be rehabilitated by the time Sunday afternoon at 4:05 rolls around.