I’ve learned a lot about labor negotiations over the past four months, but the most important thing I’ve taken away from this process is that the peaks aren’t far from valleys.

On Thursday, a 12.5-hour media session figured to be a peak in talks between the league and the trade organization formerly known as the NFLPA. On Friday, we’re deep in a valley.

According to NFL Network’s Albert Breer, there was “very little progress on key issues” today and it “seems like movement has slowed seriously.”

That doesn’t mean that there isn’t a breakthrough right around the corner, but it’s still unpleasant news for those who have been following the play-by-play of the battle over the next collective bargaining agreement.

Making matters worse, it looks as though the two sides will break for the weekend before resuming talks next week.