Final answer:
The question pertains to a character, presumably Jonas from The Giver, falling asleep while walking from sheer exhaustion; however, this detail is not found in Lowry's novel but suggests a scenario from a different story.
Step-by-step explanation:
The question "After leaving the community, when did Jonas sleep?" refers to a scenario where the character Jonas from the novel The Giver presumably falls asleep while walking due to exhaustion. This situation, however, is not part of the original narrative by Lois Lowry, but instead seems to be from another text with a similar theme of travel and weariness. In this other fictional context, it is implied that the protagonist, under great duress and fatigue, may have unwittingly fallen asleep while in motion or during a moment of extreme mental strain, thereby experiencing a dream or hallucination of homecoming and reunion, which turns out to be a delusion.