Sleeping over eight hours a day associated with greater risk of stroke

Sleeping science appears to be the diet/nutrition science of the new millennium. Every week there's a new suggestion that mixes up causation with correlation, and in the process it diminishes the popular credibility of science, when it's not seen as self correcting, but simply unable to figure out what it wants to recommend.

Woody Allen had it right in Sleeper --

Dr. Melik: This morning for breakfast he requested something called "wheat germ, organic honey and tiger's milk." Dr. Aragon: [chuckling] Oh, yes. Those are the charmed substances that some years ago were thought to contain life-preserving properties. Dr. Melik: You mean there was no deep fat? No steak or cream pies or... hot fudge? Dr. Aragon: Those were thought to be unhealthy... precisely the opposite of what we now know to be true. Dr. Melik: Incredible.

Another view: http://www.bbc.co.uk/news/magazine-16964783