The BBC and leading sleep researchers prepared a fun reaction time test. I pegged a 0.212 second average in shooting the five sheep. Don't worry, you won't actually harm any woolly guys, you are only using a tranquilizer dart, not a bullet. Good luck!
http://www.bbc.co.uk/science/humanbo...n_version5.swf
http://www.bbc.co.uk/science/humanbo...n_version5.swf