The biological clock of people is not set to be active at night, and yet thousands of people do this every night. In health care, logistics, security, etc. For some people this is not an issue, for other it is a big problem. These shift workers have an increased risk to develop health problems, which is one of the focus points of BioClock research within WP1.3 De Volkskrant national newspaper wrote an extensive article on the consequences of working at night (in Dutch).