Your battle against the Black Mage is ancient history, and your people are still cursed with eternal sleep. Even if you knew what to do, you're still too weak to do anything about it. Even though you beat him, did the Black Mage win after all?
Rowen the Fairy is worried you're sick. Go to Shining Forest Path and ask Talking Tree for a cup of Clear Tree Sap. You may not really be ill, but maybe it'll help calm your nerves.