Black cumin seeds that come from the flowering fennel plant (Nigella sativa) flavor cuisines from the Middle East to the Far East and have been used for centuries to treat chronic and infectious diseases. In a new study in the Journal of Herbal Medicine, Indian researchers report that 15 volunteers with insomnia that took 200 milligrams of black cumin oil after dinner for 28 days experienced significantly better sleep. They fell asleep sooner, slept longer and recorded increases of 82 percent in non-rapid eye movement sleep and 29 percent in rapid eye movement sleep. Stress and anxiety levels were also dramatically reduced.