Sarah begins with the monsters everyone knows from childhood: the creepy crawlers in the dark, the things we imagined under the bed or behind the closet door. The first four lines list the small rituals kids use to feel safe, like turning on lights, asking a parent to check, and shutting the closet. The tone is gentle and almost nostalgic, as if the speaker is remembering a simpler kind of fear.
Then the last line shifts everything. It asks what you do "when you become the monster you used to run from." The question has no answer and no question mark, which makes it feel unfinished and unsettled. The speaker seems to feel guilt, shame, or self-disgust, though the poem doesn't say why. Judging by the wording, the fear has moved from outside to inside. A parent can check under the bed, but nobody can check inside you. The mood goes from cozy and familiar to quietly unnerving, leaving the reader alone with that question.