The timing of light exposure, physical activity, and food intake are important cues for synchronising the biological clock. Disruption of the biological clock is a clear threat to both public health and vulnerable ecosystems. Especially in a highly industrialised country such as The Netherlands there is a mismatch between biological clocks and social demands. However, these cues have drastically – and abruptly - changed in our modern society due to the widespread use of artificial light and the round-the-clock demand for goods and services. Fundamental research has shown that precisely these conditions cause desynchrony among clock cells.