The universe contains any amount of horrible ways to be woken up, such as the noise of the mob breaking down the front door, the scream of fire engines, or the realization that today is the Monday which on Friday night was a comfortably long way off. A dog's wet nose is not strictly speaking the worst of the bunch, but it has it's own peculiar dreadfulness which connoisseurs of the ghastly and dog owners everywhere have come to know and dread. It's like having a small piece of defrosting liver pressed lovingly against you.