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Mean ± SD sleep start times at Day 1 and Day 7 during the intervention weeks for both light conditions (flashing red and flashing blue lights). Sleep start times after flashing blue light at Day 7 were significantly later than at Day 1 (t(21) = 3.2; p = 0.004) but there was no significant difference in sleep start time from Day 1 to Day 7 during the week that participants were exposed to the flashing red light mask. * = statistically significant
