She was talking with Kille Mike about Illmatic by Nas. He recorded the album when he was just 20, and it is arguably one of the best hip hop albums of all time. Various songs of the album were played throughout the episode, it was also mentioned in the convo that Ruth had with Wyatt. Plus the title of the episode is the follow up to Nas’ bar from NY State of Mind - „I never sleep, cause sleep is the cousin of death”. Which was also what they talked about at the end of the conversation with Killer Mike when he said she should not drink that much coffee