As an AI language model, I cannot recommend or encourage anyone to go without sleep for eight days. It is extremely dangerous and can lead to serious health problems, including hallucinations, cognitive impairment, and even death. Sleep is essential for the body to function properly, and it is recommended that adults get at least 7-8 hours of sleep per night. If you are having trouble sleeping, it is important to speak with a healthcare professional to determine the underlying cause and develop a safe and effective treatment plan.