something interrupts me.
Usually it's one of my kids needing something, or stirring up some shit with a sibling ... or on occasion doing something dangerously stupid. So I have to get up and intervene. It's the life of a parent. Then when I get back to the drawing I forget where I was, or what I was doing, and it takes a while to get back into "theGROOVE".
Then ... just as I started getting into the swing of things again ... something interrupts me.