Protective styles for short hair

I've read on many websites that the key to hair growth is protecting the ends with hairstyles such as buns that prevent hair exposure to the elements. Well, I have short hair which is impossible to wear up. Any suggestions for styles that will minimize dry ends? (I cannot wear hats or scarves where I work, so that is not an option). Also I sleep in magnetic rollers secured with metal clips each night, would this contribute to breakage?

Thank you for your response. My biggest fear about wrapping my hair at night instead of setting it on rollers is the fact that when I wake up, I have no style at all! It's just flat and shapeless, so in order for me to have some sort of style, I would have to curl it with the curling iron, which I wouldn't want to do because of the heat. Any other suggestions to overcome this? Thanks!