Found this in one of my old hard drives. This article was probably taken from MSN Health website; I do not have the source. Why Do We Need Sleep? Unless a person gets enough sleep, his performance is likely to be sadly lacking. Not just sexual performance either. Work performance, creativity, reaction time, and mood all become worse when we're tired. Although it's not entirely clear why we need sleep, the effects of sleep deprivation justify trying to get enough. How Much Sleep Do We Need? The amount of sleep needed depends upon the individual and their age. Some people manage on four or five hours of sleep a night. On average seven, eight, or nine hours of sleep a night is what the majority of young and middle aged men need to stay bright-eyed and bushy-tailed during the day. As we get older we tend to need less sleep. For peak performance during the day about four or five 90-minute sleep cycles are needed to rest and re-charge the brain. Each cycle combines deep slee...
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