The RAF did use Tamazapam, ("Normison"), during the Falklands war but shortly after, according to my AME, it was found to have a much greater half-life than previously thought and was banned by the UK CAA. In its place came Zopiclon(spl?), ("Zimmervane"), leaves a foul taste in the mouth but does get you off to sleep with little or no after effects, even Zopiclon may have been superseded by now!