Indeed I was talking about muscle repair, and I did say that sleep seems to play an important, although not well understood role in mental functioning. But apparently your reading comprehension is failing you...perhaps you need some sleep?
How many references would you like me to supply you with that support what I've written? Just give me a number and I'll be sure to write up a list of textbooks and peer reviewed studies from reputable journals.
And your misuse of the word "empirical" clearly reflects your lack of a scientific background. Empirical: based on actual observation or experimentation. Used in a scientific atmosphere this means observation obtained during controlled research adhering to the scientific method. Not the same as your misguided musings and inferences from what a bunch of bodybuilders do. Maybe you have epidemiological and empirical confused.