Polysomnographic Sleep Measures during B2, SR1 and SR5 for Met/Met, Val/Met and Val/Val Subjects (Mean ± SD)

*p values are for the comparison of the three genotypes. Equipment problems resulted in some data loss. Final sample sizes were: at B2, Met/Met (n = 19), Val/Met (n = 59), and Val/Val (n = 39); at SR1, Met/Met (n = 16), Val/Met (n = 60), and Val/Val (n = 41); at SR5, Met/Met (n = 20), Val/Met (n = 58), and Val/Val (n = 43).†Different from Met/Met, p††Different from Val/Met, paGenotype effects (Stage 1 duration: F2,99 = 3.15, p = 0.047; Stage 1 %TST: F2,99 = 3.72, p = 0.028).bNight × genotype interaction (F3.87,191.578 = 2.65, p = 0.036).cNight × genotype interaction (F3.92,194.083 = 2.81, p = 0.027).Abbreviations: Total Sleep Time (TST); Wake After Sleep Onset (WASO); Slow-Wave Sleep (SWS); Rapid Eye Movement (REM).