Wales’s Jamie Roberts ready to put sleepless nights to bed against Japan

• Centre was dropped to bench for first time in seven years against Argentina• ‘I could think of a few expletives to describe how I played against Australia’Jamie Roberts has made his reputation as one of the leading midfielders of his generation by confronting problems head on. That was his approach when he was told last week he had been dropped to the bench by Wales for the first time in seven years following an uncharacteristically diffident display in a crushing defeat against Australia.It was Roberts’s 30th birthday when he was told he would not be present in the starting team against Arg…