Do's and Don'ts for Washing Your Hair in Twists

I've been washing my hair in twists for many many years now. I've learned a lot in the process. Not only are twists an excellent way to save time during your wash day, they enable you to have a style that's ready to leave the style with immediately after washing your hair. However, here are some do's and don'ts if you do decide to wash your hair in twists. Do you wash your hair in twists? What are some of the obstacles you have faced?