When you plop your hair overnight, you are essentially allowing it to dry in an odd-shaped position. This can be beneficial because the form of your hair will help define and add volume to curls or waves. Plopping also helps reduce frizz by holding down flyaways and preventing moisture from evaporating too quickly. However, if done incorrectly or left on for too long, plopping can cause breakage due to the tension created when wrapping the towel around your head. To ensure that this does not happen, make sure that you do not wrap too tightly and limit how long your hair is held up in the towel (usually no more than 30 minutes). Additionally, using a silk scarf instead of a regular cotton one will help prevent damage from friction as well as give extra hold while sleeping. All in all, plopping your hair overnight can be a great way to achieve bouncy curls but should be done carefully so that it does not result in any kind of damage!