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. Author manuscript; available in PMC: 2016 Mar 14.
Published in final edited form as: Sleep Health. 2015 Mar 1;1(1):75–82. doi: 10.1016/j.sleh.2014.12.009

Figure 4.

Figure 4

Mean ± SD DLMO times for baseline and intervention weeks for each group (normal sleepers and early awakening insomniacs) and for both light conditions (flashing red and flashing blue). DLMO times were significantly later in normal sleepers than in early awakening insomniacs both at baseline (t(23) = 3.8; p = 0.001 for baseline flashing red light and t(23) = 4.0; p = 0.001 for baseline flashing blue light) and after the two light interventions (t(23) = 4.9; p < 0.0001 for flashing red light and t(23) = 3.1; p = 0.005 for flashing blue light). There was also a statistically significant difference between DLMO times at baseline and after the flashing blue light condition for normal sleepers (t(16) = 3.9; p = 0.001) and for early awakening insomniacs (t(7) = 4.3; p = 0.004).

* = statistically significant