Sleep problems are prevalent among individuals with Rett syndrome. We aimed to investigate sleep problems in individuals with Rett syndrome and their caregivers. A total of 29 participants diagnosed with Rett syndrome and their respective 29 caregivers were included. The Children Sleep Habits Questionnaire (CSHQ), the Pittsburgh Sleep Quality Index (PSQI), the Center for Epidemiologic Studies Depression Scale (CES-D), and the actigraphy data collected from Actiwatch 2 were used to investigate the change of sleep pattern. Based on the CSHQ questionnaire, 75.9% (22/29) of the patients reported sleep disturbances. The younger patients exhibited higher CSHQ scores. Actigraphy data revealed that both young and older patients had short total sleep duration, low sleep efficiency, long sleep-onset latency, long awaking duration, and fragmented sleep. The caregivers reported significantly higher PSQI scores, mildly declined sleep efficiency, and shorter total sleep duration in the actigraphy study. Associations were identified between smaller head circumference and shorter total sleep duration, more severe motor dysfunction and longer wake after sleep onset, worsen scoliosis and more awakenings per night. Sleep efficiency was inversely associated with epilepsy and positively associated with somatic growth. Sleep disturbances are common and should be investigated in individuals with Rett syndrome and their caregivers.