There are many head-wrapping scarves to choose from, but the best ones for preserving your hair overnight are silk or satin. These materials reduce friction between your hair and your pillow, thereby eliminating frizzy ends when you wake up. You can choose any bandana-style, turban-style, or neck scarf, just so long as you can wrap and tie it around your head. Large wrapping bonnets are also available, but these may allow too much room for your hair to move around and are better used on large braids or locks. Try to stick with a scarf that you can wrap and tie firmly to your head. To help preserve your straightened hair, use an overnight serum that’s low in alcohol and high in keratin protein to sleep in. Squeeze a dime-sized amount of serum onto your fingertips, and work the serum into your hair using downward strokes. You will need to have your hair in 2 sections for this wrap technique. Use a comb or hair pick to make a part in the center back of your head. Tilt your head down, place your comb or at the back of your head and center it to create the part. If you have a side part in front, you can create a middle part there as well to have an equal amount of hair in both sections, but it’s optional. Brush out your hair, first brushing it forward away from your new part in the back. Then brush the front towards the back on each side, so that you have 2 evenly sized chunks of hair on each side. It may help to loosely tie a hairband around 1 side to keep it from joining the other side as you start the next step. Gather the hair on the left side of your head, about midway up in the back, as if you were going to make a pigtail. Bring the section tightly over the back of your head, so that the ends rest on the right side of your head and secure it with 1 curved bobby pin if your hair is newly styled. Do the same thing with the right section of hair, wrapping it tightly around the back of your head toward the left.  If you have a left side part, wrap your hair going to the right. If you have a right side part, wrap...

TL;DR in Vietnamese:
Mua một cái khăn lụa hoặc khăn vải satin. Sử dụng ngón tay để thoa tinh chất dưỡng tóc qua đêm. Chia tóc từ chính giữa sau đầu. Chải tóc trong khi vẫn giữ phần tóc đã chia. Quấn mỗi bên tóc thật chặt quanh phía sau đầu. Cố định đuôi tóc bằng kẹp tăm. Trùm khăn lên tóc đã được quấn để giữ yên.