Charles Spurgeon Commentary 2 Kings 20:2

"Then he turned his face to the wall, and prayed unto Jehovah, saying," — 2 Kings 20:2 (ASV)

Then he turned his face to the wall, and prayed unto the LORD, saying,

What did he do that for? Well, as he could not rise from his bed through weakness, he gets the greatest privacy he can, and the God who accepted Carmel as Elijah's prayer-shrine would accept Hezekiah's prayer when he turned his face to the wall.