Study objectives: To examine cross-sectionally and prospectively whether informal caregiving is related to sleep disturbance among caregivers in paid work.; Methods: Participants (N=21 604) in paid work from the Swedish Longitudinal Occupational Survey of Health. Sleeping problems were measured with a validated scale of sleep disturbance (Karolinska Sleep Questionnaire). Random-effects modelling was used to examine the cross-sectional association between informal caregiving (self-reports: none, up to 5h per week, over 5h per week) and sleep disturbance.