Protagonist and mother of three who becomes overwhelmed by sleep deprivation and postpartum exhaustion. She accepts a night nanny to cope, undergoes a psychological breakdown, and ultimately realizes the nanny is a dissociative alter-ego created to help her survive the transition. She reconciles with her husband and learns to parent independently.
Tully is hired as a night nanny to manage household duties and care for the children.
Craig is Marlo's affluent brother who initially offers financial help.
Marlo is the mother of Sarah, the eldest child.
Marlo is the devoted mother of Jonah, who struggles with sensory sensitivity.
Marlo and Drew are married parents navigating severe postpartum exhaustion.
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