This is a strong possibility. The fact that his voice was monotone certainly seems to point in that direction.

Being a sleepwalker myself, I can tell you you wouldn't believe the things you can do. Peeing random places is the most common thing (and is exacerbated if you drank a lot, but also happens when you're sober). I've also wandered into people's rooms, said some weird cryptic things and went back to bed when asked. Sleepwalkers are more responsive than you think they are and they'll usually they'll go to back to bed when asked.

You can usually tell when a person is sleepwalking because they have a blank look, it's especially noticeable for people who know the person because it seems like their soul is gone. It's not a good idea to wake a sleepwalker, as long as they're not a danger to themselves. I can't imagine how that guy who woke up in a stranger's apartment must have felt. I've woken up once during sleepwalking when I was a teenager and it was extremely disconcerting and scary. I was dressing for school and causing a ruckus in my room. Weirdly, what woke me up was the sound of my mom walking up the stairs. Imagine suddenly waking up and realizing that you're in the middle of putting your pants on. Yeah...

My coup de grace, though, was grabbing a 20-inch CRT TV (the old heavy type) in my room and letting it go on the ground. It was completely dark, but I managed to do it anyway, because if you live somewhere, the dimensions of the rooms and different items are commited to muscle memory, so you know where things are. The sound didn't even wake me up, and luckily it didn't land on my toes. It woke up my girlfriend, though, she jumped up and turned on the light. I'm standing in the middle of the room and I ask her, "Where's the couch?" Her: "You mean the bed." Me: "No, couch." Her: "No, go back to bed."

I proceeded to lie down on the bed, but vertically and not horizontally, and instantly falling asleep. She had to turn my body around (not easy considering I weigh almost twice as much as her) to put me in the right position because I was completely unresponsive. When I woke the next morning, she told me everything. I didn't believe her. So she pointed to the ground, and there it was, the TV lying there.

In my new place, I've fallen off our mezzanine bed and rolled down the almost-vertical 2 meter long stairs. Apparently I went, "oww, oww, oww" for about 2 minutes as my girlfriend was frantically asking me if I was OK. Then I just got up and went to the bathroom. I had only a bruised knee in the end. Had I been awake, I'm sure I would have tried to do something stupid to break the fall and ended up with a serious injury.

Whatalife.

Good news is, I'm getting my Swiss citizenship in a few months and this definitely means no army. I hope the army guys ask for eye witnesses, my girlfriend is always up for telling some of these gems.

Maybe your uniform guy was kicked out of the army and subconsciously playing out his frustrations in his sleepwalking.