Do cows sleep standing up?

One popular variant relies on a supposition that cows lean into a steady wind while asleep in order to keep balance. Based on this, the cow tipper lightly pushes against one side of the cow's torso, and gradually increases the force of push. The cow, while asleep, leans into the push and remains upright. Then when the cow tipper has all of their body weight on the cow, they jump to the side. The cow, still leaning into the ‘wind’, tips over in that direction.