Sleep and Mental Health: 7 Ways the Bidirectional Crisis Makes Improving Sleep a Primary Psychiatric Intervention

This article examines the bidirectional relationship between sleep and mental health and evaluates the evidence for sleep-focused interventions as primary psychiatric treatments. Drawing on a landmark PLOS Mental Health narrative review (Hyndych et al., December 2025, DOI: 10.1371/journal.pmen.0000531) covering literature from 1990 to March 2025; a JAMA Psychiatry 2024 component network meta-analysis of CBT-I (highest remission OR 2.50); Frontiers in Psychiatry 2026 evidence synthesis (28 papers, all high quality); and Stanford Medicine research (August 2025), the article documents seven bidirectional pathways through which sleep and psychiatric health interact. Neurobiological mechanisms examined include amygdala hyperreactivity and PFC-amygdala disconnection under sleep deprivation; HPA axis dysregulation and cortisol elevation; circadian system disruption as a transdiagnostic risk factor; and glymphatic system impairment from disrupted slow-wave sleep. The evidence for CBT-I as first-line psychiatric intervention — including its superiority over pharmacotherapy in long-term outcomes and the FDA clearance of digital CBT-I (SleepioRx, 2024) — is reviewed alongside India's sleep crisis (1 in 3 Indians suspects insomnia, 25.7% pooled clinical prevalence, 50% sleeping 6 hours or less, Great Indian Sleep Scorecard 2025 and medRxiv meta-analysis 2023). The Ayurvedic identification of Nidra as one of three Trayopastambha (pillars of health) and Yoga Nidra's documented psychiatric and sleep effects are presented as the ancient Indian framework that anticipated sleep medicine's central findings.