A dragons have evolve from many creatures, they have eagle´s wing power, bat´s wings, lizard´s scales, and very strong tail. Eve is using her tail to sleep upside down like a bat. And don´t worry blood going in brain with full force.
This was made november 17, 2019.
Old versio: https://www.weasyl.com/~rathaloshunter16/submissions/1901280/sleeping-upside-down