"Makura no Sôshi" is original Japanese title of the famous work "The Pillow Book" by Sei Shonagon (circa 1000). This is a collection of over 300 brief paragraphs and are her informal memoirs of her days as a lady-in-waiting to the Empress Teishi. The title comes from the casual notes on stray slips of paper that one might jot down at night and place in the drawer of one's wooden pillow.
Along with Murasaki Shikibu she was one of the greatest writers of the Heian era.