Ep 5. Diane's Nightmare

In the season 4 episode 5 of Cheers named Diane's Nightmare, we see a shift in Diane and Sam's relationship. The episode starts with Diane experiencing pauses in her memory, causing her to forget important details about her life. She comes to know that it's a side effect of her new medication.

Meanwhile, Sam is feeling neglected by Diane's preoccupation with her memory loss and goes so far as to lie about being diagnosed with a brain tumor as a tactic to get her attention. As Diane becomes increasingly distressed and anxious about her health, she becomes convinced that Sam is hiding something from her.

Adding to Diane's stress, she begins having vivid nightmares about being trapped on the Titanic, which seems to represent her fear of being trapped in a life where she has lost her memory. She becomes quite irrational and starts to act out her dreams in the bar, much to the confusion of the other patrons.

As the episode progresses, we see that Diane's nightmares and Sam's lie all come to a head, leading to a dramatic confrontation in the bar. In an emotional conversation, Diane realizes that she has been neglecting Sam and he has been feeling alone and unimportant in their relationship. She acknowledges that her preoccupation with her own problems has caused her to forget the needs of those around her.

Overall, the episode is a poignant exploration of the impact of health concerns on one's relationship and the need for communication and support in such situations. The audience is left wondering whether Diane and Sam's newly found understanding will be enough to save their relationship or not.