Final answer:
The protagonist in 'Stolen Day' learns the most through self-realization, while characters in 'The Night the Bed Fell' learn the least as they undergo little to no change.
Step-by-step explanation:
In the stories "Stolen Day" and "The Night the Bed Fell," the character who learns the most is the protagonist of "Stolen Day," a young boy who concocts a belief that he has inflammatory rheumatism. Through his experience, he gains a deeper understanding of his family's concern—or lack thereof—and the consequences of seeking attention through deception. On the contrary, the characters in "The Night the Bed Fell" do not exhibit significant personal growth or learning. James Thurber, the protagonist of this story, recounts chaotic family events humorously, with the characters remaining largely unchanged. The boy from "Stolen Day" undergoes a transformation in realizing the folly of his ways, thus learning the most among the characters from both stories.