The Intersection of Insomnia Disorder and Major Depressive Disorder: A Clinical Perspective

Major depressive disorder (MDD) is associated with profound sleep architectural alterations including reduced slow wave activity, increased delta sleep ratio, REM sleep disinhibition, shortened REM onset latency, and increased REM density. Antidepressants, though mitigating depressive symptoms, often disrupt sleep patterns, highlighting the delicate balance between treatment benefits and sleep-related impacts. Comprehensive assessment and management of insomnia is pivotal due to its significant implications for effective clinical management and treatment outcomes in MDD. Nonpharmacological treatments, notably cognitive-behavioral therapy for insomnia (CBTi), and digital CBTi (dCBTi) should be considered. CBTi unravels maladaptive sleep beliefs and behaviors, yielding improvements in both insomnia and MDD symptoms. Digital CBTi platforms extend accessibility, offering potential relief to a broader demographic. Sedating antidepressants, nonbenzodiazepine hypnotics, and atypical antipsychotics address insomnia within MDD, with cautious consideration for side effects. A combination of pharmacotherapy with CBTi might yield augmented outcomes in patients with MDD and comorbid insomnia. Ketamine, electroconvulsive therapy (ECT), repetitive transcranial magnetic stimulation (rTMS), vagal nerve stimulation (VNS), and deep brain stimulation (DBS) explore novel dimensions in treating treatment-resistant depression, potentially influencing sleep disruptions. [ Psychiatr Ann . 2023;53(11):502–507.]