Thai Ngoc, also known as Hai Ngoc, is a Vietnamese man who has reportedly gone without sleep for over six decades. Despite numerous medical examinations, doctors have not been able to explain his condition. Thai Ngoc claims that he suffered from a fever in 1973, which resulted in his insomnia. He has tried a variety of remedies, including traditional medicine, to no avail. Despite his lack of sleep, Thai Ngoc maintains a relatively healthy lifestyle and has no major health issues.