Dark night of the soul -- hers, or mine?

Yesterday the pages flew by ... I described them as a river. Today: a trickle. After I'd been writing for hours, the page count was ... four. Four pages. To be fair, today's pages are mostly monologue, rather than dialogue, so they add up to more minutes than the usual four pages, but still. Difficult to get those words down today. It seems that writing the dark night of the soul is not so easy as I thought it would be. Oh, I so blithely tossed it off yesterday as I forecast today's writing. Oh yes, today I would put my protagonist through hell. Ha. Methinks it was the other way 'round. I am literally sweating today as I write. I realized as I wrote that I am sitting here with the windows closed, even though it has warmed back up to 80 degrees. So, I got up and opened the windows. Doh. Much better. Still, I did feel as though I were pushing the words through a sieve to get them out of my head and onto the computer. I'm hoping the rewrites will be easier.
Tomorrow I'll add to this scene, then on to the next where she will arrive at the solution.