else to bowl; alternatively, keeping the bowler on may be deemed the best chance of getting the batsman out or restricting the scoring rate. If the regular bowlers are not achieving the desired results, the captain may decide to use non-regular bowlers to attempt to unsettle the batsmen. The captain may also change the bowlers around to introduce variation, and to prevent the batsmen getting "set". In limited overs cricket the captain additionally has to make certain that bowlers bowl no more than their allotted maximum number of overs, and that experienced bowlers are available at the end of the batting side's innings, when the batsmen are usually looking to take risks to attack and score quickly. In the longer forms of cricket, when a new ball becomes available the captain decides whether to use it, and when given that it can be taken any time after it becomes available. Batting order When the team bats, the captain decides the batting order. In professional cricket the captain usually changes the established batting order only for exceptional reasons, because batsmen tend to specialise in batting at certain positions. However, in certain circumstances it may be in the team's interest to change the batting order. If quick runs are needed, a naturally attacking batsman may be promoted up the order. A player who is 'in form' may be promoted to a higher batting position, at the expense of a player who is 'out of form'. If a wicket falls near the end of a day's play, especially if the light is failing, or if the bowlers seem particularly confident, the captain may choose to send in a non-specialist batsman, referred to as a nightwatchman. If the nightwatchman does not get out before the end of that day's play then the specialist batsman will have been protected, and will not need to bat until the following day when conditions are likely to have improved. If the nightwatchman does get out, the cost of losing a late wicket will have been minimised, because the specialist batsman is still available to bat. Declarations The captain may declare the team's innings closed at any time, but usually only does so as an attacking ploy, for instance if the captain thinks the team has enough runs to win the match, or if a sudden change in conditions has made it advantageous to bowl rather than bat. Follow-on