What do you call a sleeping bull?

A bulldozer.

Did You Know?

"Bulldozer" sounds like "bull dozer" — a bull that's dozing (sleeping)! Real bulldozers got their name in the 1800s from the idea of a "dose" powerful enough for a bull. Modern bulldozers can push over 70 tons of material, while actual bulls sleep about 4 hours per day in short intervals.