What is Yoga Nidra?

Yoga Nidra — "yogic sleep" — is a systematic guided meditation conducted entirely in savasana (lying down). The practice leads the practitioner through progressive stages of internalization toward a hypnagogic state: the threshold between waking and sleep. In this state, the brain produces alpha and then theta waves — the same frequencies associated with deep REM sleep and creative insight. Unlike sleep, however, the practitioner maintains a thread of conscious awareness throughout. This combination of deep physiological rest with maintained witnessing consciousness is the practice's defining feature.

The modern systematic form of Yoga Nidra was developed by Swami Satyananda Saraswati of the Bihar School of Yoga, whose 1976 text "Yoga Nidra" codified a reproducible protocol drawn from classical Tantric nyasa practices (the deliberate placement of consciousness in parts of the body). The Bihar School protocol includes: settling intention (sankalpa), rotation of consciousness through the body (61-point or 31-point rotation), pairs of opposite sensations, visualisation, and return to normal waking state. Variations exist — Richard Miller's iRest protocol, which has been used in Veterans Affairs clinical settings for PTSD, is one example of a research-validated adaptation.

A 45-minute Yoga Nidra session is often described as equivalent to four hours of conventional sleep — a claim that reflects the quality of delta-wave rest achieved, not a direct one-to-one substitution. For women in chronic stress, insomnia, emotional exhaustion, or grief, it is among the fastest-acting restorative interventions available. In a retreat context, Yoga Nidra typically runs as an evening session after a physical practice, or as a standalone daily element in programmes focused on nervous system recovery.