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By right, most should be sound asleep, bar the more troubled and workaholics among them all. Erwin does notice a faint light from a nearby meeting room and out of curiosity, investigates as the door is ajar. With a small creak, he enters and is met with eyes as bright as his own. Instantly, he is recognised-- a book in his hands in dim light. It reminds him well of the past, almost something reminiscent of nostalgia, if it could even be called such. He approaches him as he sits, not bothered or about to lecture, he simply watches for a second.
There's a little more leniency in regards to the boy-- usually, all sightings past a certain time would be met with a firm-but-fair warning to head to bed. But, Erwin does understand this sleeplessness. He's been there many times before, especially in youth. He understands; to the mind, man-made time meant nothing, but his tone still hints a little insistence-- he does not encourage his own bad habits, after all.
"I do hope you plan on sleeping soon."