Dreamt I was drawing a heart that kept changing its own anatomy

I'm at my drafting table and the heart on the page won't hold still — each time I ink a vessel, it reroutes itself, growing a new branch I didn't plan. The surgeon from last week's project leans over my shoulder and says 'more red,' but the red keeps turning blue before I can mix it. I wake up with my hand cramped like I'd actually been drawing for hours.