Armodafinil patients also demonstrated significantly greater improvements in GAF score ( 9 hours : 9.5 vs 5.4 , P < 0.0001 ; > 9 hours : 9.6 vs 4.3 , P = 0.0019 ) and KSS score ( 9 hours : -2.9 vs -1.9 , P = 0.0002 ; > 9 hours : -2.8 vs -1.6 , P = 0.00 28 ) .