What time is it? Noon? Bleh, I can sleep for another couple hours.
Alternatively; Huh? Wha? Oh, I need to get up? Ok. *falls back asleep for fifteen minutes* Fine fine, I'm getting up. Let me take a shower. What? Zombie invasion?... Let me take a shower, then I'll deal with it.
What? There's no running water? Someone is going to die. Slowly, painfully.