Commentary for Isaiah 39:1

when he heard that he had been ill and had recovered He was accustomed to eating after the first three hours of the day had elapsed and he would sleep until the ninth hour. Since the sphere of the sun had gone backwards because of Hezekiah, he awoke from his sleep after nine hours and found that it was morning. He sought to kill all his servants. He said, “You let me sleep a day and a night until morning!” They said to him, “It was the sphere of the sun that went backwards.” He said to them, “Who brought it back?” They said to him, “The God of Hezekiah, etc.” As is stated in Tanhuma (Ki Thissa 5) and in Pesikta (d’ Rav Kahana p. 14a).