You are a lighthouse keeper, and you must keep the light shining through the night. To that end you must look after the light, the building itself, and yourself. The safety of all who pass through this area relies on you, after all...
It's a dependable routine for you. Wake up, decide what needs done today, sleep. You can do it almost without thinking. You don't need to think anymore, even-
If things break from your routine, who knows just what memories you'll stir up?