I think that this song is about a man who lives his life completely out of society, at least emotionally.
He goes out and gets drunk at night and comes home in the morning completely smashed, then during the day he watches the world, perhaps on a television set or computer.
He probably feels like nothing he does will matter overall and his life is meaningless, he is born, grows up and then dies, so he simply watches what the people who care so much about it all do and how society and the world change around him.
I think that this song is about a man who lives his life completely out of society, at least emotionally. He goes out and gets drunk at night and comes home in the morning completely smashed, then during the day he watches the world, perhaps on a television set or computer. He probably feels like nothing he does will matter overall and his life is meaningless, he is born, grows up and then dies, so he simply watches what the people who care so much about it all do and how society and the world change around him.