There are anecdotes all over the place, but the nugget of truth is that the human body can only exert so much effort, which means elite athletes have fairly limited training hours. But that still leaves plenty of time for things like film study. And far from getting merely "enough sleep every night", most athletes have to get even more sleep, which takes time away from the rest of life. It's still a very focused existence--but then, you don't receive exceptional results from less-than-exceptional input.