This method of curling your hair is both, cost effective, and environmentally friendly! Unfortunately my hair is way too long to pull this off, and not to mention I don’t think I could sleep with a spaceship around my head, but if you’re hair is fine, and or medium length I think this look could totally be pulled off.
I would suggest doing this with damp hair, as I think it would increase the curl even more. I like the idea of not having to use a curling iron or a flat iron which can damage your hair, and on top of that not having to use energy to curl your hair is so much better for the environment!
For loose carefree waves, I’d give this one a go.