A person who has performed duties on an aircraft must not drink alcohol or take any other intoxicating or narcotic substance during the first six hours after such duty, if he understands or ought to understand that a police investigation may be initiated concerning his behaviour on duty.
So you've come off a long day, have minimum rest and would like a couple of sherbets to help the transition from On duty to Off duty and then into sleep. This could even be the first day of a block of days off. Are they really saying that your OFF duty time only starts 6 hours after you've signed off? I wonder what other professions in Norway are subject to these draconian measures.