Are you asking if it's possible that people drink blood? It is and many do. If you're asking about immortals that turn into bats and are exclusively nocturnal, then no, I doubt it.
The Anne Rice kind.
What are the Anne Rice kind?
Do they grow long teeth?
If so then no, I don't believe you can naturally change the shape of your teeth.
Do they go pale?
This is possible, because they just have to avoid sunlight.
Do they bite sleeping people's necks for bloods?
This might happen if a lunatic thinks he is a vampire, and I know that many people like to pretend to do so. Also, as previously stated, many people enjoy drinking blood.