What is the minimum amount of sleep a person can survive on?

The minimum amount of sleep a person can survive on varies, but most adults typically require about 7 to 9 hours of sleep per night for optimal health. While some individuals may function on as little as 4 to 6 hours, chronic sleep deprivation can lead to serious health issues, including cognitive impairment and weakened immunity. Extreme cases of severe sleep deprivation can result in serious consequences, including hallucinations and even death, highlighting the importance of sufficient rest.