The female protagonist, suffering from severe insomnia, discovers she can only sleep peacefully with Edward by her side. She offers him a huge sum of money to be her "human sleeping pill." Countless nights they spend together evolve from simple companionship to unconscious embraces, and then to the comfort of exploring each other's bodies in the darkness. When therapy becomes dependence, and when the employer-employee relationship is tainted with love, how will they face the world after dawn?