Experimental and epidemiological evidence shows that long-term disruption of endogenous circadian rhythms, in particular due to exposure to light during the biological night, may be associated with a wide range of common non-communicable diseases (NCDs), including cancers, cardiovascular diseases and major metabolic disorders (obesity and type 2 diabetes) [1-7]. The prevalence of circadian disruption in human populations is high and increasing due to expanding human activities over the 24-hour day in both the working and the general.