I recently became a SAHM.
Because I have a tendency to overthink things if I don't keep busy, I have enrolled myself into a number of courses / exercise classes and voluntary projects, but still have at least half of every school day free.
I thought I was going to use this time to get the house and garden sorted, but I reckon I'm doing less housework than I did when I was working. I can always do it tomorrow you see and Bargain Hunt is stupidly adictive 
What tricks do you play on yourself to make yourself just do it?