Getting into the habit of wrapping your hair in a silk scarf can prevent your hair from breakage and split ends as you sleep at night. It will also help to keep your hair tangle free and easier to style in the mornings. Also having your hair wrapped in a scarf can prevent dryness of the hair at night, especially if you sleep on a cotton pillowcase, which draws moisture out of the hair.
Brush or comb your hair back from your face so that you can make sure to get all the hair wrapped into the scarf.
Drape the scarf over your head and gather the loose ends of it toward the back as though you are going to make a ponytail out of it.
Take the "ponytail" of the scarf and begin to twist it over and over tight enough so that it is not unraveling itself as you go.
Start wrapping the "ponytail" around itself until it begins to form a bun. Then tuck the loose piece inside the bun so that it does not come loose as you sleep.