The T-Notes/T-Bonds usually have some volume from 2AM to 4AM CT (morning in the Europe, I guess they also trade TN/TB) and then become silent for sometimes. When do those guys in Chicago begin to trade? Is it 7:20AM CT for the outcry? In the index futures, the market usually has at least some movement throughout the trading hour. But for the TN/TB, the prices could stay the same for a long time. Are those guy going to take a break or sleep?