I used to have really, really long hair. I would lay my head on the pillow and then grab my hair, kinda in a ponytail grab, but just kinda throw it behind my head, so it’s spread out on my pillow. So, it was out of the way. And no bunched up hair under my cheek, if laying on my side.
However, sometimes I threw my hair in Hubby’s face, cause my hair was just so long. He would just adjust it on my pillow so that it’s not in his face.
My hair goes wherever it wants as long as it doesn’t touch my face. I just move it out of my face and the rest is wherever. I could never sleep with my hair up, that would drive me to the brink.