You suggest that all these symptoms can come from a night on the tiles and some good grub but clearly haven't had the time to do the reading of info put out by the industry. They know it's happening-Why are you all in denial?
The info is there for those who care about their colleagues and passengers, health and safety.
The CAA recently reported:
"Although the exact cause of crew incapacitation is not yet known, the most probable source is oil leaking from the engines or APU and contaminating the air supply to the cabin and cockpit through the air conditioning system"
" circumstantial evidence suggested potential contamination of cabin air by abnormal concentrations of noxious gases or vapours"
-Now go read the airworthiness Regs-25.831 a/b !!!
& for those who think it's safe bar drinking- get real or take some reading lessons- Read the label for a start!