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An important conceptual change in the measurement of night work appeared in 2013, in the Employment surveys. Until 2012, the question was asked in a very general way: "In your main job, do you (or did you) work at night?" and the respondent could answer among "1. Usually; 2. Occasionally [2. Some nights, before 2002]; 3. Never." The "occasionally" response was chosen by a large number of respondents without it being possible to specify the greater or lesser regularity of night work. Since 2013, the question is asked only for the reference period of the survey: "We will now focus on the four weeks from Monday ... to Sunday ... (including the reference week). [...] During those weeks, did you work at night?" and the respondent can answer among "1. Yes, half of the working days or more [1. Yes, half of the working hours or more, between 2003 and 2020]; 2. Yes, less than half of the working days [2. Yes, less than half of the working hours, between 2003 and 2020]; 3. No." These fundamental differences in the way of approaching the fact of working at night therefore require clearly separating the series on night work, with initially an indicator of overall night work (until 2012), and secondly an indicator of actual night work (since 2013).