IF they had done the the ILS this would not have happen but this being said where was atc while this going on ? I bet they never make that mistake again. I did some blunders while I was flying so feel kinda sorry for them but it is a serious mistake.
I have line pilots tell me its happen to them One told me that the sun woke them up .On long haul it can be down right boring and not enough rest only adds to prolem It may be that they do need a reminder in that a flashing lite or warning buzzer every so often has to be reset . How many of us have fallen asleep watching tv ?