Application segmentation dissects the Circadian Rhythm Sleep Disorders Drug market by the specific disorder it targets. Insomnia accounts for the largest share, roughly 30%, driven by the high prevalence of chronic sleep onset and maintenance difficulties and the extensive utilization of melatonin receptor agonists. Delayed Sleep Phase Disorder (DSPD) follows with about 25%, reflecting growing awareness among adolescents and young adults and the adoption of chronotherapy‑aligned pharmacologics. Non‑24‑Hour Sleep‑Wake Disorder, primarily affecting blind individuals, represents ~20% of market value, underscoring the niche yet critical demand for FDA‑approved agents that stabilize endogenous rhythms. Shift Work Disorder (SWD) contributes near 15%, as occupational schedules increasingly clash with circadian biology, prompting off‑label use of wake‑promoting drugs. Finally, Advanced Sleep Phase Disorder (ASPD) holds ~10%, a smaller segment due to its lower incidence but notable for specialized formulations. Collectively, these application sub‑segments shape the overall market size and are central to the “Circadian Rhythm Sleep Disorders Drug segmentation” analysis.