Legendary Vampiric Weaknesses
In many modern legends, vampires do not necessarily need to sleep, but they must retreat to a dark, safe place (like a buried or entombed coffin) when the sun is shining, for a period of immobility, powerlessness, and sometimes unconsciousness. This is when the vampires are most vulnerable, and must take great pains to hide and protect their resting places.
I have the same weakness, because when I fall asleep, there could be an earthquake, and it wouldn't wake me. *Laughs*
The Fiction Writer