At the end of Chapter 6, the narrator tells readers that Bilbo "dreamed of his own house and wandered in his sleep into all his different rooms looking for something that he could not find nor remember what it looked like."

I think we are trying to interpret Bilbo's dream here. I'll go with "C" as the closest. What we find is that, in Bilbo's dream, the feather-bed is a metonym that stands for his entire house and the comforts of being at home. As much as his body needs sleep, his spirit needs home: "all night he dreamed of his own house and wandered in his sleep into all his different rooms looking for something that he could not find nor remember what it looked like." This is certainly a contrast to the rambling through the caves and it strengthens the search and "quest" motif of The Hobbit.