Man lying on a wall

"I breathed in. The smell of cold and wet London streets reached my nostrils. I began walking down the street, the old and too familiar street. I have been walking down this exactly street every day since I moved from Ireland. I reached for my cigarettes in my front pocket, the frustration was getting to me, I mean doing every day for 20 years was tiring..."

The man lying on the wall, why was he lying there? Who is he?