Sometimes I watch the same dvd because its comforting to me. I know it will not make me think about anything that upsets me..I forget about my life for a couple of hours and am truly happy. And I kind of do the same thing with staying up late.. I stay up late bc I know that as soon as I get in bed everyone thing i hate about my life will come pouring into my brain.. and if i wait til im exhausted ill just pass out in 10 mintues. So maybe its not an obsession, you staying up til a certain time, maybe you are just making an excuse to not go to bed.