Sleepless Nocturne Final Empress Verified -

The writing shines here. We learn that the Empress is not keeping the protagonist awake out of malice, but out of a desperate need for a witness to her eternity. The "sleepless" state is a metaphor for her inability to let go of the past or to find peace in death. The route reveals that she has been waiting for a specific soul—implied to be the protagonist—to break her cycle.