Isaiah 38:2 - Albert Barnes' Notes on the Bible

Then Hezekiah turned his face toward the wall - The wall of the room in which he was lying He was probably lying on a couch next the wall of his room. Eastern houses usually have such couches or ottomans running along on the sides of the room on which they recline, and on which they lie when they are sick. Hezekiah probably turned his face to the wall in order that his emotion and his tears might not be seen by the bystanders, or in order that he might compose himself the better for devotion. His prayer he wished, doubtless, to be as secret as possible. The Chaldee renders this, ‘Turned his face to the wall of the house of the sanctuary;’ that is, of the temple, so that it might appear that be prayed toward the temple. Thus Daniel; when in Babylon, is said to have prayed with his windows opened toward Jerusalem Daniel 6:10. The Mahometans pray everywhere with their faces turned toward Mecca. But there is no evidence in the Hebrew text that Hezekiah prayed in that manner. The simple idea is, that he turned over on his couch toward the wall of his room, doubtless, for the greater privacy, and to hide his deep emotion.