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I had a similar experience. I used to drive/manage bands on tour for a living. Did a euro tour with a grindcore band who all got fucking battered every night. The first night we stayed in a grotty squat in Ghent, the sleeping arrangement was a load of mattresses on the floor. I got woken up in the middle of the night by the vocalist getting up, stumbling around and then pissing on his mattress, getting tucked up in his sleeping bag and going back to sleep.
A few nights later when I was awoken by the same guy stumbling about, heading towards my bed with his nob out, all warnings not to wake a sleepwalker went out of the window as I desperately shouted at him to wake up. Fond memories.
I used to be in the TA, there was always a sleep-Walker-pisser. Strangely they usually peed in someone’s open rucksack but occasionally a sleeping comrade got a “golden reveille”.
I watched someone sleepwalk around a barrack room looking for a loo, before peeing on his own bed, getting into it and snuggling down.