It has been hanging upside down in its small world, thinking about its bat life with a small head. It’s just that we humans have not invented a product that can establish a friendly communication bridge with bats, so our stupid humans see people hanging upside down and do not move to think that people are sleeping.
But, the bats crouching out is also a biological attribute. The reason is that most of their food is some insects such as mosquitoes and moths. These insects are relatively active during the day. The most important thing is that during the day, there are other animals that like these bats like bats and bats. Because of its own physical structure, bats are not particularly agile in their movements. It is very likely that they will not be able to eat anything but be eaten by other big-sized animals, but they also have to eat and live. Insects have rested and unexpectedly let them be eaten in their sleep, reducing their capture process, reducing their strength and being able to eat, and insects also reduce pain in the process.
The second reason is that the bat eyes are not very good. They can even be said to be a bit awkward. They rely on ultrasound to distinguish the direction. During the day, the sounds of all things awaken are too much. They can’t find the direction to find the prey. It is very possible that there is no way. Going home is too dangerous for them.