I've not seen a single study to demonstrate causative link, or conclusively eliminate other variables (which is frankly quite impossible anyway). Unfortunately

I've not seen a single study to demonstrate causative link, or conclusively eliminate other variables (which is frankly quite impossible anyway). Unfortunately a lie repeated a thousand times (by media) becomes truth. And it's just too juicy of a news to say "sleeping too much bad for health". Especially managers, they love that kind of news ;-) BTW my frustration is pointed at general media and society, not you in particular, I wasn't clear.