a slight trendP = 0.07
Tryptophan levels in maternal plasma were significantly affected by sleep condition (F 2,19 = 4.5, P < 0.05), but not recovery time (F 1,19 = 0.23, P = 0.63) and there was a slight trend towards an interaction between sleep condition X recovery time (F 2,19 = 3.0, P = 0.07) ( Fig. 4 A).