Hamlet 1.5 Discussion: The Ghost Departs

Claudius instructs Hamlet not to act against his mother, suggesting her conscience will punish her. As dawn nears, the sky brightens, making fireflies less visible, signaling the ghost's return to purgatory, as it can only wander the living world at night.

How does the approaching morning affect the visibility of the fireflies?

What does the ghost's return to purgatory signify?