Well, after reading all the replies, and going me? not me? finally decided, I too am an unpredictable sewer, depending on body.
But, I seem to sew MOST, on a good day, after breakfast and housework.
I finally realized, that if i walk into home-cave and switch machine on, then sewing is going to take place. If I don't switch it on soon, I will end up distracted messing and gauming with all kinds of stuff in there, but no stitches get made.
I feel especially good after putting a few miles, or even a quarter mile, on my machine. :D