In Mark's account, where was Jesus sleeping when the storm struck the boat?

Answer: On a cushion in the stern

Jesus was in the stern, sleeping on the cushion. The disciples woke him: "Teacher, don't You care that we are perishing?"

“Soon a violent windstorm came up, and the waves were breaking over the boat, so that it was being swamped. But Jesus was in the stern, sleeping on the cushion. So they woke Him and said, “Teacher, don’t You care that we are perishing?””— Mark 4:37-38 (BSB)