Light significantly improves alertness during the night (Cajochen, Sleep Med Rev , 11, 2007 and 453; Ruger et al., AJP Regul Integr Comp Physiol , 290, 2005 and R1413), but results are less conclusive at daytime (Lok et al., J Biol Rhythms , 33, 2018 and 589)....
Light is the most potent time cue that synchronizes (entrains) the circadian pacemaker to the 24-h solar cycle. This entrainment process is an interplay between an individual’s daily light perception and intrinsic pacemaker period under free-running conditions....
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