When, in your sleep, you figure out the answer to whatever your having problems with in the CS or Blender, etc.
:D
My issue is the reverse.. I end up on grand occasion having a nightmare that involves a problem that doesn't even exist with my mod.. When I awake I find myself contemplating the issue that I was contemplating in my little *nightmare*.. only to find it's completely irreverent, and no issue at all.. but apparently.. my *subdued* mind while asleep felt it was an issue

A few more..
When you are wanting to start up your web browser and strangely find yourself staring at the construction set loading :blink:
When you feel like if you open the Cs one more time tonight.. it is possible the Cs has the ability to turn your body into 10,000 tiny little molecular balls and then scatter them across the room..