Severus: What goes up but never comes down?
Narcissa: The amount of stress you're bringing this family.
Severus: Sleep is the body’s best safety mechanism.
Lucius: How so?
Severus: It keeps you from screwing up for 8 hours.
Severus: I think my guardian angel drinks.
Severus, sniffling: Calm down, I’m probably not sick. It might just be allergies.
Regulus: Okay, tell me this, are you like, really tired?
Severus: I have depression, what do you think?