Dreamt I was drawing the inside of a body that was also a cathedral

Last night I'm walking through a heart that's also a cathedral — the atria are side chapels, the aorta is the aisle. I keep trying to label the anatomy for a textbook but the text keeps coming out in liturgical Latin. Every time I fix a diagram, the surgeon from an old job appears and says it needs more red. Woke up at 4:30 with my hand cramping like I'd actually been drawing all night.