When it is not in flight, a bat's normal position is head down. A bats hold on its roost is so powerful that it may not be broken even when the animal dies. Bats do drink water. Bats are pollinators, seed dispensers and pest controllers. Most bats are clean, healthy and not aggressive toward humans.
Bats are shy and avoid people.
Even sick bats rarely attack, unless they are threatened. Bats do get rabies, as do most mammals. Unlike some animals, rabid bats are not aggressive. No matter how much a person may appreciate the contributions of bats to a healthy ecosystem, the unpleasantness of sharing living quarters with them can be intolerable. A liberal deposit of mothballs or naphthalene flakes, an odorous deterrent will generally drive them out.