Ep 3. Rudy's All-Nighter

In season 5 episode 3 of The Cosby Show, titled "Rudy's All-Nighter," the youngest member of the family, Rudy, plans to stay up all night to work on a school project due the next day. With the rest of the family asleep, Rudy takes this opportunity to stay up late and work on her project in peace and quiet. However, as the night goes on, Rudy begins to feel the effects of sleep deprivation and struggles to stay focused on her project.

Meanwhile, Cliff and Clair are hosting a dinner party for some of Cliff's colleagues and their wives. Clair is stressed out about the party, trying to make sure everything runs smoothly, while also keeping an eye on Rudy. As the night progresses, Cliff and his colleagues begin to have a bit too much to drink, leading to some humorous and unexpected situations.

Back at home, Rudy starts to hallucinate due to lack of sleep, causing her to see strange visions of her family members. She even starts to talk to her imaginary friends, which leads to some funny and heartwarming moments. Eventually, Clair realizes that Rudy has been up all night and decides to help her finish her project so she can get some rest.

Overall, "Rudy's All-Nighter" is a heartwarming and humorous episode that showcases the strong bonds within the Huxtable family. It also addresses the importance of getting enough sleep and the consequences of not taking care of oneself.