Interesting article from the BBC about historic sleeping patterns http://www.bbc.co.uk/news/magazine-16964783. Whether any of this is valid is another story, I thought it was an interesting read nonetheless.
The strength trainee says "Why sacrifice intensity when I can sacrifice volume"
The bodybuilder says "Why sacrifice intensity when I can sacrifice form"
"We are not sport, when there is a sport issue, we are not so good. The boxer is much better than us at boxing. But he will have to protect his balls if he wants to punch us."