I think it might be about being relaxed. I get mine when I'm laying (lying-not sure which is correct) in bed. I keep a pen and sticky pads on the nightstand.
Yes, so much so that I now keep a legal pad and pen right outside the bathroom, so that when I get out of the shower with an idea, I don't have to drip through the house looking for something to write it down with.
Last week I got so inspired I hopped out to write the plot point down, and then realized I hadn't washed my hair yet and had to get back into the shower - lol.
~suki