Why Do Bats Sleep Upside down?

Answer

Bats’ wings are not as powerful as that of the birds and they cannot produce the necessary lift for starting a flight. The hind legs of bats are also not designed for them to run and gain the momentum for flight. Hanging upside down gives bats an ideal position to take off into a flight when necessary. They can just let go and on their fall through the air they will get the necessary momentum for taking off into flight. 
1 Additional Answer
Bats sleep upside down to help them take off into flight. Bats lack the wing and leg strength to propel themselves into flight from a standing position like birds.
Q&A Related to "Why Do Bats Sleep Upside down"
Bats sleep upside down because they like the sensation when the blood rushes to their heads. But seriously, they sleep upside down because they have trouble flying if they are on
http://answers.ask.com/Science/Other/why_do_bats_s...
Bats sleep hanging upside-down because it will. directly fly when it wakes up!
http://wiki.answers.com/Q/Why_bats_sleep_hanging_u...
Bats cannot launch themselves into flight from the ground, like birds do so they must
http://www.chacha.com/question/why-do-bats-sleep-u...
Bats always sleep upside down hanging from a high and secluded spot. The biological characteristics of bats make it necessary for them to sleep in this fashion. Bats cannot launch
http://answers.yahoo.com/question/index?qid=201109...
Explore this Topic
Bats sleep hanging upside-down because it will. directly fly when it wakes up! ...
Bats sleep during the day because they are nocturnal, meaning they are active at night. They are the only flying mammals that hang upside down when sleeping, alone ...
For a better take off is the main reason bats hang upside down at night. It is also safer for then to hang upside down because they will be able to get away faster ...
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