Table 1 Results of the analysis of variance for different physiological variables and subjective sleepiness over the time course of the study. In bold results with p < 0.05.

KSS

F _1,35.8  = 12.5, p  = 0.0011

F _2,1943  = 9.4, p  < 0.0001

F _20,1937  = 93.4, p  < 0.0001

F_2,1943 = 1.5, p = 0.2290

F _20,1937  = 3.8, p  < 0.0001

F_40,1937 = 0.6, p = 0.9874

F_40,1937 = 0.5, p = 0.9935

Melatonin

F_1,35.9 = 2.7, p = 0.1070

F _2,1943  = 14.2, p  < 0.0001

F _20,1926  = 106.2, p  < 0.0001

F _2,1943  = 5.2, p  = 0.0058

F _20,1926  = 2.4, p  = 0.0004

F _40,1926  = 2.2, p  < 0.0001

F_40,1926 = 0.7, p = 0.9007

Cortisol

F _1,34.9  = 9.2, p  = 0.0046

F _2,1823  = 3.3, p  = 0.0357

F _20,1802  = 150.2, p  < 0.0001

F _2,1823  = 19.1, p  < 0.0001

F _20,1802  = 2.1, p  = 0.0026

F_40,1802 = 0.6, p = 0.9616

F_40,1802 = 0.9, p = 0.6851

DPG

F_1,35.1 = 2.7, p = 0.1088

F _2,1189  = 15.8, p  < 0.0001

F _13,1183  = 94.2, p  < 0.0001

F _2,1189  = 9.8, p  < 0.0001

F_13,1183 = 1.3, p = 0.2075

F_26,1183 = 1.0, p = 0.4328

F_26,1183 = 0.2, p = 1.0000

Proximal temperature

F _1,35.1  = 4.9, p  = 0.0330

F _2,1188  = 30.8, p  < 0.0001

F _13,1183  = 18.8, p  < 0.0001

F_2,1188 = 1.7, p = 0.1790

F_13,1183 = 0.7, p = 0.7959

F_26,1183 = 0.4, p = 0.9922

F_26,1183 = 0.2, p = 1.0000

Distal temperature

F _1,35.1  = 6.1, p  = 0.0183

F _2,1187  = 18.0, p  < 0.0001

F _13,1183  = 76.9, p  < 0.0001

F _2,1187  = 14.9, p  < 0.0001

F_13,1183 = 1.6, p = 0.0918

F_26,1183 = 0.6, p = 0.9204

F_26,1183 = 0.2, p = 1.0000

Wrist Activity

F_1,35.8 = 3.4, p = 0.0735

F_2,1233 = 2.4, p = 0.0896

F _13,1224  = 14.9, p  < 0.0001

F _2,1233  = 37.0, p  < 0.0001

F_13,1224 = 1.6, p = 0.0904

F_26,1224 = 0.3, p = 0.9994

F_26,1224 = 0.5, p = 0.9909