"What troubles thee, Father?" On his feet Thor walked with the Allfather listening to his tale of darkness and woe. "Aye, Earth is never dull this is certain. The battle with the Titans had me worried, never before hast thou entered the Odinsleep twice in one year let alone in the same season. How art thou feeling, Father?"
Thor was worried about his father, as a physician of Midgard he'd seen children become orphans in the blink of an eye and despite being the son of a God King he'd begun to realize that Odin would not always be there. Asgardians while powerful were not immortal - time would one day claim them if battle did not.