Whatever you were doing just before reading this, walking to work, drinking a coffee after lunch or winding down in the evening in your favourite armchair, it is likely you will do it again tomorrow, more or less at the same time. This daily cycle is a reflection of the fact that we live in a 24-hour environment that, through rhythmic changes in light, temperature and social interactions, imposes temporal constraints on our lives. However, we do not simply react to those daily changes; rather, we anticipate them and behave accordingly.

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