I feel that when I manage to get into a writing groove. I can't stop, it is an amazing time of clarity, like I can see into another world and I'm a conduit for their story to get into our world. I can hear conversations, feel points of view, and get into the heads of real people of my imagination.
Lately, my life has gotten in the way of writing new content, more than a few paragraphs, and I miss being able to sit down for 8 hour stretches and get the stories out of my head.
Well, some day my kids will grow up, and I'll have time again for world building!
RE: It's actually not a brain orgasm.