A charismatic night nanny hired to help Marlo, who takes control of household duties and helps restore Marlo's intimacy with her husband. She eventually reveals her true purpose is to bridge a gap before leaving, later revealed to be Marlo's imagined alter-ego born from extreme stress and sleep deprivation.
Tully is hired as a night nanny to manage household duties and care for the children.
Tully temporarily acts as a romantic proxy to reignite Drew and Marlo's intimacy.
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