In 1969, Doctor Oliver Sacks started to treat some of the most hopeless cases of 'sleepy disease' and cured patients who had been in a state of 'sleep' for over forty years. The victims were among five million affected by a mysterious epidemic of sleepy sickness that ravaged the world from 1917-27. With footage of the responses of patients during the following months, Doctor Sacks talks of an experiences 'unlikely to repeated again in the history of medicine