Jamieson, Fausset and Brown on Mark 4:38

38. And he was in the hinder part of the ship--or stern.

asleep on a pillow--either a place in the vessel made to receive the head, or a cushion for the head to rest on. It was evening; and after the fatigues of a busy day of teaching under the hot sun, having nothing to do while crossing the lake, He sinks into a deep sleep, which even this tempest raging around and tossing the little vessel did not disturb.

and they awake him, and say unto him, Master--or "Teacher." In Luke (Lu 8:24) this is doubled--in token of their life-and-death earnestness--"Master, Master."

carest thou not that we perish?--Unbelief and fear made them sadly forget their place, to speak so. Matthew (Mt 8:25) has it, "Lord, save us, we perish." When those accustomed to fish upon that deep thus spake, the danger must have been imminent. They say nothing of what would become of Him, if they perished; nor think, whether, if He could not perish, it was likely He would let this happen to them; but they hardly knew what they said.