highly significantp < .0001
Unsurprisingly, participants in the 10-h variation slept for longer (7 h 6 min, SD = 38 min) than those in the 6-h variation (4 h 45 min, SD = 28 min), a difference which a two-tailed t test showed was highly significant, t (47) = 14.66, p < .0001, Cohen’s d = 4.34.