Script to click app on Menu Bar on Mavericks
Although this is not an ApplesSript (and I would still like to know how to resolve the question via clicking etc) there is another way to skin the cat.  The application can be installed with a command line interface.  If installed: you can turn NoSleep on as follows:

NoSleepCtrl -a -b -s 1,1


That is easy enough to script that I can even do it.