BackgroundSleep disturbance among adults has consequences for their health and functioning. Among mothers of infants, there is evidence that fatigue and sleep disturbance are significantly associated with depression, anxiety and impaired relationships with partners and infants. It is not known whether consistent evidence of such associations exists for fathers. The aim of this review was to describe what is known about fathers’ sleep and its associations with mental health and wellbeing, in the first 12 months postpartum. Methods A scoping review was conducted, searching MEDLINE complete, Scopus, PsycINFO and CINAHL complete, from 1990 to 13 May 2019. Reference lists of relevant reviews were also searched. Articles were included if they were published in English, and reported on sleep among men cohabiting with their infants from birth to 12 months. ResultsThirty-six papers reporting on 31 separate studies met inclusion criteria. Sleep constructs and assessment of these varied greatly. While some measures of fathers’ sleep improved, fathers’ fatigue increased significantly with increasing infant age. In adjusted analyses, fathers’ sleep problems were associated with poorer mental health, relationships with infants and partners, and safety compliance at work. ConclusionsFurther research on fathers’ sleep in the first postnatal year is recommended, including: validation of brief self-report measures to assess sleep disturbance and fatigue; well-designed longitudinal studies to clarify the causal direction of associations between infant sleep, fathers’ sleep and fathers’ wellbeing; and development of interventions to improve fathers’ sleep, for example by supporting parents to address infant sleep problems.