Sugarbaby (original title: Zuckerbaby) is a 1985 West German film directed by Percy Adlon and starring Marianne Sägebrecht.
Her life revolves around relaxing in an indoor swimming pool, commuting on the subway between her apartment and the funeral home, and munching candy bars in bed while watching television, which is how she revisits her teenage "crush" for the pop singer Peter Kraus and his hit "Sugar Baby".
By a process of subterfuge and detective work she learns his name (Huber), marital status (a cold, overbearing wife), and favorite candy bar.
She learns to interpret the subway network's complicated shift roster, and makes a point of occasionally crossing his path, perhaps giving him a smile of recognition.
They enjoy each other's company and she fantasizes a life together; they go to a rock 'n' roll dance evening, and when the band plays "Sugarbaby" they "let their hair down" and the other couples stand back to give them space.