My tradition is not really a tradition. It's my own habit.
Since my sewing room has an east facing window, the best natural light for the room occurs in the morning. I have exactly 40 minutes with the house to myself every morning after the husband and son leave for work and school and before I myself have to start getting ready for work. That 40 minutes is spent in my sewing room, without the ceiling lights on - enjoying the natural light, and sewing in my PJ's.