Robinson CH, Albury C, McCartney D, et al. - This is the first systematic review to investigate whether sleep duration and quality influence the frequency and duration of upper respiratory tract infections (URTIs). For studies examining associations between sleep duration or quality and URTIs, three databases and bibliographies of included papers were searched. Out of 5,146 titles, nine studies were included in meta-analyses. Compared to the study defined ‘normal’ sleep duration, shorter sleep was associated with increased URTIs, while longer sleep was not. Reduced sleep, particularly sleep of less than 7–9 hours, is linked to an increase in URTIs. To prevent URTIs, sleep-improvement strategies should be investigated.