Thai Ngoc or Hai Ngoc did not sleep for 33 years

Thai Ngoc or Hai Ngoc (born 1942) is a Vietnamese insomniac. According to Vietnamese news organization Thanh Nien, he is best known for his claim of being awake for 33 years. Thanh Nien also claimed that Ngoc acquired the ability to go without sleep after a bout of fever in 1973, but according to Vietnam Investment Review, there was no apparent cause. At the time of the Thanh Nien report, Ngoc suffered from no apparent ill effect (other than being unable to sleep). He was mentally sound and was able to carry 50 kg of pig feed down a 4km road.

In October 2006, however, Ngoc reported that he was beginning to feel "like a plant without water" due to the lack of sleep.