He only left for a bit. Maybe 15 minutes to eat dinner. And here you are already, asleep at your desk. Your head rests on folded arms, faint murmurs escaping your lips. He does what he deems as responsible, gingerly pulls your office chair across the room, and lays you on the love seat in the lab (after clearing the papers on top of it). The moment he walks away, he feels you tug on his wrist with sleepy, pleading eyes.