Contest Giveaway

Rules: Answer the following trivia questions, and I will send you a prize. Question: How can bats hang upside down on a wall and sleep without falling off the wall? Do they need to be upside down or could they sleep right-side up? If they do have to be upside down, why do they have to be upside down? The prize will be determined when you fulfill the requirement to win. At that point I will contact you and we will discuss what I send/give to you. I'm sorry this is not very thought-out, but I just realized I hadn't posted yet, and I'm about out of time. Good night!