So-called natural rhythms change for multiple, technological, socio-economic reasons, in a way that requires detailed research. For example, nocturnal activities multiply, overtuning circadian rhythms. As if daytime were not enough to carry out repetitive tasks, social practice eats bit by bit into the night. At the end of the week, in place of the traditional weekly day of rest and piety, ‘Saturday Night Fever’ bursts out.
– Henri Lefebrvre. The Rhythmanalysis Project.