Hi, My Friend Drank Last Night And Pee On The

Hi, my friend drank last night and pee on the his bedroom wall, around an hour after going to bed. He seamed completely unaware of what he was doing. I had the strong feeling he was sleepwalking.
The next morning I told him about this. And he told me that it wasn't the first time. That It started about 2 years ago. And occurred 7 times before!!!
It this normal? I'm Really concerned. Should he check himself?
Thank you