Cymbeline — Act 2, Scene 2: Imogen's bedchamber in Cymbeline's palace:

In Imogen’s bedchamber, Imogen grows sleepy after reading and tells her lady Helen to leave the taper burning and wake her near four o’clock. After the lady exits, Imogen prays for protection and falls asleep. Iachimo comes out of the trunk she agreed to keep for him and quietly studies the room and her sleeping body. He marvels at her beauty, then takes note of the furnishings and a bracelet from her wrist, and observes a mole on her breast so he can use these signs as proof of what he claims. Hearing the clock strike, he hurries back into the trunk and hides before dawn.