The emotions are already peaking. In buildings across the NFL, the anxiety and anticipation are partying together like college kids on the night final exams wrap up. That much enthusiasm is swirling, that much adrenaline pulsing. Draft weekend has finally arrived. And soon it will be over. In a blink. What happens during a frenzied 47-hour stretch of picking and trading, strategizing and recalculating gives personnel folks across the league that surge of energy. Imagine the eagerness percolating through the second floor of Halas Hall and flooding toward the Chicago Bears’ state-of-the-art draft room, where the proceedings will be monitored this weekend. This is it.