Thirty years ago tomorrow, Arsenal headed to Anfield needing to win by two goals to dethrone England’s champions and lift a league title for the first time in 18 years.The tragedy of Hillsborough had set up an unprecedented Friday night climax to the season but the visitors were long-shots to stop Liverpool claiming the double. Arsenal manager George Graham planned the raid into enemy territory to the last detail, but it all landed at the feet of Michael Thomas, with immortality up for grabs. On the Friday afternoon of May 26, 1989 David O’Leary came down the stairs of the Atlantic Tower Hotel in Liverpool to meet his dad, Christy, and some friends in the foyer. Two-and-a-half hours earlier he had retired to his room, with Alan Smith in the next bed, waiting for the slow drift of time.Matchday kips are an odd thing. Though theoretically beneficial, elite players are rarely known for sinking into a deep, patterned sleep in an allotted timeframe. Especially with one of the biggest games in the history of the old Division 1 a few hours away.Strange then that O’Leary, told already he would be playing a different sweeper role for Arsenal at Anfield in…