Or HaChaim on Genesis 3:8/אור החיים על בראשית ג׳:ח׳

1 וישמעו את קול השם They heard the voice of G'd. The reason the Torah describes the direction G'd's voice took, i.e. לרוח היום, was to enable them to find a place to "hide" from G'd. In this instance G'd's voice travelled westwards, parallel to the sun, whereas Adam and Eve were in the centre of the garden.