IHi , Hi ,I apologise for have no intentions of putting the frightners on anyone actually my intentions are to make people really aware these nap attacks can be fatal. If I had been near a tractor trailor ?????????who knows that old PD may have been a winner,. exhaustion and tiredness the majority of PDs suffer with is very different from a nap attack and hopefully you will never experience this. But I think it essential to try and follow through to see what if possible may be the cause .By the way are you from the UK Sir? 'from an old Brit Margaret Clark 48/12/60