Don't disturb its night with day, or your idea of day. If you talk be frank and open with the bat. Pull no punches. Waking is enough. Addressed, the vampire bat will go away.
Bats are, after rodents, the second most numerous mammals on earth.
The only ones to take to the air. Were once shrews, who lived, lives underground. Placental bats take to an ulterior night's air. Placental vampires serve a purpose Arjuna would have understood. We must voyage into a night, as if it were a kind of day.