Lyric discussion by mascardo 

Cover art for Mama's Room lyrics by Under The Influence Of Giants

I think the guy in this song is depressed and lonely, because he feels that something missing in his life:

"Something's got my fear, And then won't get through my head, But there's something missing, There's something missing here....I can't sleep alone,"

and he tries to make himself happier by doing things that cause instant gratification. He goes to parties in order to fill his "void" for a mere couple of hours:

"Here I go again, React without a plan, oh, ...Everybody dance, everybody feel right,"

The lines that make it most obvious that hes trying to find an easy way to satisfation are: I like the pain that comes out at night, Everybody dance, everybody feel right, I like the pain that comes out at night, Everybody dance, everybody feel right."

At parties everyone is realeasing their stress, their "pain" with others by partiying.