Lights: Much of the episode was shot with the dim lighting and inevitable dread of an ADT commercial, especially the scenes in Joan and Don's home, but each character is fixated on a fixture for a different reason.

Joan falls asleep on the couch waiting for Doctor Rapist to come home and tell her that he is the new King of All Surgery. Instead, he stumbles home and informs her that he will never be a surgeon and she can't leave her gig, or has to find a new one. In the gloom, she jiggles over to him in her nightgown (her ample cans on magnificent display) and tries to soothe her man—and herself—by taking control of the situation. She already realized that her choice was no good when all the doctor's starting talking shit about him at their dinner party, now she's stuck trying to wring the best out of a bad situation. She says that she'll take care of him as soon as she "closes the light." Like always, Joan is trying to control her own destiny, but even though she may be able to master the environment around her, the future is slipping out of her exquisitely manicured iron fist.

Don lies in bed staring at the dome on his ceiling, his mind illuminated with the thousand possibilities of a promotion at work and possibly a move to London. Last week we saw him staring at pictures of his parents in the moonlight, reflecting on the past. This week the night is just as dim, but the glare of the future is staring him down. For all the success he's had, he still wants more, and it seems like his private moments at night are the only time that he allows himself to escape the confines of "Don Draper" and really live as himself. At the end of the episode, he has another revelation in the dark, confronting Betty about their new son's name—which he doesn't like—and his honesty, with himself and his family, shines through again.

Sally, on the other hand, is filled with terror by the night, afraid that her baby brother is possessed by the spirit of her beloved Grandpa Gene. After Don hooks her up with a nightlight, she stares into it, like that is the only thing that is keeping her from being attacked by the changeling demon in the next room. But her protective aura is as false as her assumption about the reincarnated spirit of her grandfather. Only when Don calls to her, in the evening dim that consoles him, is he able to comfort his daughter and put her at peace with the newest addition to the family. It's only when enveloped in the natural light of the universe—rather than the amber florescence of the Sterling Cooper office—that we can really see these characters as human.