If you want to stay in your jammies and be comfortable while you write, that's exactly what you should do. I often sit in sweats and a tee shirt all day if I don't have to go out. Comfort is very important in writing.

Isn't it freaky to dream that you're dreaming? I dreamed that I woke up and was writing and it was something good and then I really woke up and couldn't remember what it had been that I was writing.

Good luck on writing today. Do make a lot of notes and things when you're working to keep yourself moving forward? While I was gone, I set myself up LJ's for various projects/series and it was amazing how much it helped to put notes and thoughts to myself in there.