I hate nightwatchmen. Like many, I'm sure. The concept is stupid, the execution is even more stupid and the whole thing is, overall, just...stupid. Today's major beef is that I think they negatively impact upon the batting of the proper batsman, by a) giving him one extra thing to think about and b) putting all run-scoring pressure onto the said batsman. Meanwhile, they're worse equipped to face difficult bowling (often in failing light).
And, if your nightwatchman gets out before stumps, do you bring in another? The case, based on the usual logic of using them, is even stronger now than when the first one came in. Where does the madness stop?