Insomnia Disorder is rated by the U.S. Department of Veterans Affairs under DC 9400 of 38 CFR § 4.130, DC 9400 across 6 severity tiers (0% / 10% / 30% / 50% / 70%…). Service connection requires (1) a current diagnosis, (2) an in-service event, injury, or exposure, and (3) a medical nexus opinion linking the two under 38 C.F.R. § 3.303.
Insomnia Disorder is a DSM-5 sleep-wake condition defined by persistent dissatisfaction with sleep quantity or quality, marked by trouble falling asleep, staying asleep, or waking too early and being unable to return to sleep. The disturbance occurs at least three nights per week for at least three months despite adequate opportunity to sleep, and produces clinically significant daytime distress or impairment in functioning. The VA rates it as a mental disorder under Diagnostic Code 9400, so the daytime cognitive and emotional consequences (fatigue, concentration loss, irritability, mood disturbance), not the bare hours of lost sleep, drive the evaluation.
Rating criteria text quoted verbatim from 38 C.F.R. § 4.130 (Mental disorders). Source verified 2026-05-15 by ClaimRecon Editorial Team against the Cornell Law CFR mirror; eCFR.gov is the authoritative government source.