Amazing knowledge for sleep,must read it

All of you know sleep is absolutelty essential for all human beings... Despite scientiest still not figuring out the process,entirely ..we still know a lot about this daily actiity, every mammal,birds,most reptiles and fish required to sleep for function, here on this image there is some intresting knowlede that you never know about your sleeping position,i want to share this with you in this way you can get some intresting knowledge of yourself,,
Read this care fully on image,