Dementia-related sleep changes can lead to disruptions among families living with dementia which can jeopardise carers’ wellbeing and ability to provide support. This research explores and represents the sleep of family caregivers across the trajectory of caring, before, during, and after the key period of their care recipient moving into residential care. The focus of this paper is viewing dementia caregiving as a trajectory, characterised by care needs which change over time. Semi-structured interviews were conducted with 20 carers whose family member with dementia had transitioned into residential care within the prior 2 years. Themes constructed from these interviews indicated that sleep was linked to earlier life course patterns as well as to significant moments of transition in the caregiving journey. As dementia progressed, carers’ sleep progressively worsened in relation to the less predictable nature of dementia-symptoms, difficulty maintaining routines, and constant responsibilities creating a state of high alert. Carers attempted to facilitate better sleep and wellbeing for their family member, often sacrificing their own self-care. Around the care transition period, some cares reported not realising how sleep deprived they were; for others the busy momentum continued. After the transition, many carers acknowledged that they were exhausted, although many had not realised this while providing home-based care. Post-transition, many carers reported ongoing sleep disruptions associated with poor sleep habits established whilst caring, insomnia or nightmares and grief. Carers were optimistic that their sleep would improve with time and many were enjoying sleeping according to their own preferences. The sleep experience of family carers is unique and includes tensions between their essential need for sleep and the experience of care as self-sacrifice. Findings have implications for timely support and interventions for families living with dementia.