Biological rhythms and sleep research are currently amongst the most important areas in public health. Sleep pathologies have reached epidemic proportions over the past decades and a large number of people worldwide suffer from chronic ‘circadian’ disruptions, i.e. conditions describing the increasing discrepancy between the timing of our internal biological body clocks and that of our social environment. These include various forms of sleep disturbances and rhythm disorders, such as ‘social jet lag‘, i.e. the disruption of an individual’s sleep/wake rhythm due to social constraints (e.g. work hours). Social jet lag is directly comparable to ‘desynchronosis‘, commonly known as jet lag. Desynchronosis has been classified as one of the circadian rhythms sleep disorders and while the issue of jet lag is especially pronounced for airline crew, social jet lag affects a large number of people chronically resulting in health problems, including sleep, cardiovascular, and metabolic pathologies, digestive disorders, impaired immune function, increased cancer risks, and a drastic decrease of mental and physical performance.