This is an addictive game that certainly won't put you to sleep.
There's this flock of sheep, see? Without warning, one of the critters will make a dash for the other side where the grass is probably greener. It's your job to click the tranquilizer button before he gets too far. (spoilsport!!)
You have to stop five sheep in the least possible time, and you're rated on your reaction times.
Warning: Clicking before the sheep moves gets you a 3 second time penalty