Ask the doorman who he's seen today.

He looks a little pensive, but eventually answers. "I, uh... This big guy? He came in, started talking to folks, asking them to go upstairs for some reason, but that's all I heard. Uhm, I dozed off a little after. It's been a long night." It's abundantly clear to you that the hotel has this guy working long shifts. Seems like he hasn't gotten a proper night's sleep in days.