He started taking yoga and meditation classes to get in touch with his 'inner self'. [=the emotional and spiritual part of himself]
She was her 'old self' again after some sleep. [=she returned to behaving/feeling as she normally did after some sleep]
She helped without any thought of 'self'. [=without any thought of trying to make things better for herself]
(..) Well, it's like that. With feelings. - Oh wow. Are you in trouble. - Big time! Want a wedding dress? Hardly used. I think we are getting a little ahead of selves here. Okay. Okay. I am just going to get up, go to work and not think about him all day. Or else I'm just gonna get up and go to work. (..)1994 TvShow: Friends Title: The One Where Monica Gets a Roommate Season: 1 Episode 1