Adam Clarke on Jonah 1:5

Cried every man unto his god - The ship's crew were all heathens; and, it is probable, heathens who had each a different object of religious worship.

Cast forth the wares - Threw the lading overboard to lighten the ship, hoping the better to ride out the storm.

Jonah was gone down - Most probably into the hold or cabin under the deck; or where they had berths for passengers in the sides of the ship, something in the manner of our packets.

Was fast asleep - Probably quite exhausted and overcome with distress, which in many cases terminates in a deep sleep. So the disciples in the garden of Gethsemane.