Summary of sleep and phase shift results.

Values are averages±SEM.#Statistics computed using the Wilcoxon matched pairs test.*Phase angle = Sleep onset time - DLMO time.All times are given in hh:mm.In coherence with a significantly later circadian phase, lights off time, bed time were significantly delayed under SW light weeks in comparison to BE light weeks. On the other hand wake up time was not significantly different between lighting conditions, this leading to a significant decrease in sleep duration under SW light weeks. Sleep efficiency was not different between lighting conditions. Phase angle between DLMO and lights off was not different between lighting conditions.