וַיִּֽירְא֣וּ הַמַּלָּחִ֗ים וַֽיִּזְעֲקוּ֮ אִ֣ישׁ אֶל־אֱלֹהָיו֒ וַיָּטִ֨לוּ אֶת־הַכֵּלִ֜ים אֲשֶׁ֤ר בָּֽאֳנִיָּה֙ אֶל־הַיָּ֔ם לְהָקֵ֖ל מֵֽעֲלֵיהֶ֑ם וְיוֹנָ֗ה יָרַד֙ אֶל־יַרְכְּתֵ֣י הַסְּפִינָ֔ה וַיִּשְׁכַּ֖ב וַיֵּרָדַֽם׃
사공이 두려워하여 각각 자기의 신을 부르고 또 배를 가볍게 하려고 그 가운데 물건을 바다에 던지니라 그러나 요나는 배 밑층에 내려가서 누워 깊이 잠이 든지라
Rashi
each one... to his god—Of the seventy nations of the heathens were there.
Ibn Ezra
He lay down and slept - from seasickness, and perhaps this was his first time on a ship.