This assumes that there is a time when vampires have to go away.
Vampires always arrive late and stay to the wee hours before dawn. (Sigh) Before I continue, it might help to clarify whether we are talking about real or fictional vampires. So, with fictional vampires, the second answer is probably correct, whereas real vampires (yes, they are real - go to http://www.religioustolerance.org/vampyres) are not immobilized during daylight, nor do they "sparkle" in the sun. So, there really is no set time.
Well most of us attack at night only cause sunlight can kill.....:MWAHAHA)
While you are sleeping...ie in your dreams.
They come out at night for hunting.
it depends on the vampire...most of the times they just attack.
Frostbites
Nobody is ast risk because vampires are fictitious beings.
no, but in book four, Percy thinks that the emposai that attack him are vampires.
It depends on what kind of vampire vampires in the twilight series just attack people,but the Cullen's survive on animal blood instead of humans blood. But in other cases vampires will just attack or seduce their victims then drain them of their blood.
by sitting on a unicorn
They attack like each other like they would anything, but to kill each other they tear them apart and burn the pieces
vampires are not real
It has not yet been ascertained but there has been cases of alleged attack by vampires on people
It really depends on the type of blood the human has .
When vampires are about to attack they usually appear but not before
well....... vampires don't exist......... and you need to say more at risk than what a werewolf or ghost? but in books vampires seem to be the biggest risk in a attack......