Cotton is both drying and dehydrating to your hair, causes tangles and damage and shortens the life of your style.
A silk or satin scarf, bonnet or pillowcase are all great options to protect your hair.
And nightly "pineappling" of your hair will help in preserving the fullness of your styles.
For my vegan Queens: silk is made from fibers produced by silkworms. Satin is a better option. It's a type of weave and is made from rayon, nylon, polyester or charmeuse. Either option, silk or satin, ensures more moisture for your hair!