In the sport of cricket, a nightwatchman is a lower-order batsman who comes in to bat higher up the order than usual near the end of the day's play. The nightwatchman's job is to maintain most of the strike until the close of play (remaining in overnight, hence the name) and so protect other, more capable batsmen from being out cheaply in what may be a period of tiredness or in poor light at the end of the day, and then again the following morning when the batsmen have not yet `got their eye in,' or when the early-morning conditions may favour the bowlers. The theory is that losing two top-order batsmen in quick succession would be worse than losing one top-order batsman and a tailender.