I know I've been in (more or less) the same boat as you for the past couple years. I'm either too tired or two sick. I have noticed that I'll scrap in spurts -- get 1 to 12 pages done as long as the mood strikes me, then let it go for a while.
It happens and it's okay. I don't doubt you'll get the urge and lock yourself away until you get it out of your system. Do you have anyone around to help/care for the kids every now and then?