You might think, as I did until the other day, that we need less sleep the older we get.
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Also, AST just wrote an excellent article that dives much deeper into this subject - Check it out: http://www.ast-ss.com/dev/qa_search/full_text.asp?ID=2974
Sleep is also critical to muscle gains, particularly if you are following a weight training program. A lack can short circuit all of your hard work in the gym. A recent study by The Eastern Virginia Medical School showed that those who slept that much more a night on average had a Body Mass Index of five points lower than others in the study.
A lack of sleep has many negative implications including hypertension and higher levels of cortisol in the body, which leads to weight gain. Studies have shown that people who get the least amounts of sleep are typically the most overweight obese people are more likely to suffer from such ailments as diabetes and heart disease.