Sleep disturbances are prevalent among patients with bipolar affective disorder (BPAD) and may influence treatment outcomes. This study investigates the association between sleep disturbances and treatment efficacy in BPAD patients. The objective was to evaluate the extent to which sleep disturbances impact the therapeutic response, relapse rates, and overall symptom improvement during treatment. Utilizing a cohort of 150 BPAD patients categorized by the presence or absence of clinically significant sleep disturbances, treatment outcomes were assessed over a 12-month period using validated scales. Patients with sleep disturbances exhibited delayed symptom remission (mean reduction in Hamilton Depression Rating Scale: 17.4 ± 3.2 versus 20.1 ± 2.8, p < 0.01) and higher relapse rates (35% versus 18%, p < 0.05) compared to those without disturbances. These findings suggest that managing sleep disturbances should be a priority in BPAD treatment plans, potentially improving therapeutic outcomes. The study introduces novel insights into the interplay between sleep and mental health in BPAD, underscoring the importance of integrated care approaches. Further exploration of sleep-targeted interventions is warranted.