The goal of this observational study is to learn if acutely and/or chronically altered sleep induces inflammation and/or a pro-thrombotic state (a tendency to form clots) in hospital workers who either work in shifts or are exclusively daily workers. The main questions it aims to answer are: * Does chronically altered sleep induce a pro-inflammatory and pro-thrombotic state, which are steps towards cardiovascular disease, knowing that is associated with poor sleep? * Does acutely disrupted sleep, such as that observed in night shift workers, induce a pro-inflammatory and pro-thrombotic state in otherwise healthy subjects? Participants in the study are hospital workers who either work in shifts, including night shifts, or only during the day. Sleep quality is assessed by a validated questionnaire (the Pittsburgh Sleep Quality Index). Markers of inflammation and of the pro-thrombotic state are measured at baseline and, if appropriate, after the night shift. These are markers of platelet activation, D-dimer, Interleukin-6 and endothelin 1, known to contribute and/or to suggest a condition of generalized inflammation and a tendency to form clots. Relevant information on health status is also collected for each participant.
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Sleep disorder
Timeframe: measurement relates to previous three months