Really? How is this even considered a problem? I've slept on curlers just fine (on my side! and on my back!), and I ALWAYS sleep with my hair in tight, hard buns.
It's just a matter of getting used to it, so don't tell me Au Ra which are born with these horns couldn't get used to sleeping on something hard on the side of their head in their minimum 16 years of being alive >.>

Also, fabric does not tend to rip unless you put considerable force to it, even with something sharp, meaning your pillow/bed is just fine even with spiky horns and tails on it. The sharp ends will just scrap over the surface and not actually penetrate it.