Crafting is good for your brain

Seriously.  I don't know if there are studies out there to back it up, but I can tell you from experience, its a hard core mental workout.  I've been pondering the logisitics of making a felt dollhouse for my 2 year old for Christmas for weeks.  Tonight, I sat down to work on it.  I think I have it all figured out, but man my brain hurts.  I'm stopping and going to bed before I make a mistake that will have me seam ripping and swearing (something I'm trying to reign in, as my 2 year old is apt to repeat our choice words any day now).