In the absence of normal cues of daybreak and nightfall, we know that the circadian rhythm keeps people entrained or aligned on a 24 hour daily resetting. Its even more interesting and displays again just how important lighting is for your wellbeing.  In 1958 a study by J. Woodland Hastings and Beatrice M Sweeney showed that subjects had quicker auditory reaction times and fewer lapses of attention under blue light as they suppress delta brainwaves and boost alpha wavelengths that are connected to alertness.  We need more human centric lighting in all spaces we occupy to help maintain our wellbeing and health.