Since I primarily trade options, I am interested whether anyone traded any options positions during the Monday's session? Generally, I avoid trading the first hour of a session, especially on Mondays. That rule does not apply to closing positions. Sometimes you just have to get out. But I am much more deliberate when opening new positions. Hence, I wait for my target stocks to find its daily range and for the bid/ask spreads to tighten. That usually happens either after about 45min of trading or in some sessions only by the afternoon.