An ongoing source of angst in our house is knotty hair. My daughter's hair tends to tangle overnight, resulting in daily screaming sessions while I brush. It's painful for all of us.
We've taken to plaiting the hair most nights, but sometimes she's too overwrought to even do that. Hence, a satin pillowcase. I hate sewing with satin, but the went together surprisingly quickly, French seams and all. A project with a real purpose.