Polysomnographically assessed sleep parameters in the Moderate Light and Bright light group.

Mean and SEMS for sleep parameters for the two treatment groups. Data represent the averages of sleep episodes 7 and 8 for all subjects, with the exception of subject 1041 from the Bright Light group in whom only sleep episode 7 was included. n = 7 in each condition. % represents the percentage of that sleep stage expressed relative to total sleep time. P values indicate the significance of the difference between the Treatments as assessed in a two-factor Mixed Model ANOVA with factors Treatment and Sleep period. Sleep latency data were log-transformed prior to statistical tests.