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 july 7, 2017.
Redraw: https://www.weasyl.com/~rathaloshunter16/submissions/1901281/sleeping-upside-down-redraw