During the Middle Ages Thyme was often placed beneath pillows to help promote a peaceful sleep and to ward off nightmares, for centuries, Thyme has been used across nations and cultures for incense in holy temples and ancient embalming practices. Today, Thyme is commonly used as a seasoning, but it also produces a potent essential oil that has cleansing and purifying effects for the skin. Thyme should be diluted with a carrier oil before application.