You know how your kids haven't totally figured out the time difference yet? You know how your kids probably get cranky an hour early in the evening (is it just mine?). When my kids are tired the get CRAZY. Persnickety is the best word for it. I have a solution--though this might only work for younger kids. I imagine that there is a point when they won't do it any more. Probably about the same time they don't fall for "I am going to time you and see if you can run upstairs and get my remote/slippers/book in less than 30 seconds".
Here is one of our favorite games (and they still think it is a game. Suckers). Find what motivates them (money for child #1, Popsicles for child #2). Put on a loud song and tell that that whoever can jump or dance for the longest amount of time gets the prize. If you have really competitive children, your kids will be too exhausted to fight and will be THRILLED to sit and watch a movie.
Seriously. This one saves my life.
You are welcome.