Currently looking for the song in season 5 episode 7 : "The Tricks Episode" 18:30
TT stops to talk to Mel and tell her she should just get in the car and go and then in the background the song I'm looking for fades in. I don't know what the lyrics actually say or who sing it. I've been looking for years. The song says something along the lines of "do you sleep crazy, crazy / laughing / loving it's all i really-" and I don't know the rest.
If yall find the song let me know. Keep me up to date.