Final answer:
Sleep is essential for our bodies to function properly. Accumulating a sleep debt can lead to decreased alertness and mental efficiency, as well as increased susceptibility to illness.
Step-by-step explanation:
A man cannot go 8 days without sleep. Sleep is essential for our bodies to function properly. Without sufficient sleep, our physical and mental abilities deteriorate. As we accumulate a sleep debt, our levels of alertness and mental efficiency decrease, and we become more susceptible to illness. It is important to prioritize sleep and aim for 7-9 hours of sleep each night.