Nidra Yoga

The word yoganidrā in Sanskrit texts

Two Sanskrit scholars, Jason Birch and Jacqueline Hargreaves, trace yoganidrā through Sanskrit literature and report several meanings. In the Mahābhārata, usually dated between 300 BCE and 300 CE, it names Viṣṇu's sleep between cycles of the universe, and in the Devīmāhātmya it names a goddess. They state that these early uses describe a god's sleep, not a technique of yoga.

They report meditative uses in some Śaiva and Buddhist Tantras, and say the term enters yoga texts only in the 11th to 12th centuries, as a synonym for samādhi, a state in which the yogin does not think, breathe or move. Examples are the Amanaska, the Yogatārāvalī and, in the 15th century, the Haṭhapradīpikā. In the 17th century it also became the name of a posture.

The twentieth-century guided method

Birch and Hargreaves attribute the modern meaning, a guided meditation done lying down, largely to the technique taught by Swami Satyananda Saraswati and the Bihar School of Yoga. His book Yoga Nidra, first published in 1976, says the seven-part method was assembled from little-known practices in various Tantras. Sources differ on dating: a 2022 narrative review places the systematised practice in the 1960s, and a 2025 meta-analysis gives 1976.

Birch and Hargreaves find the multi-stage technique in no ancient or medieval text but identify analogues for several stages, including lying supine to dissolve the mind in the 12th-century Dattātreyayogaśāstra, nyāsa (placing mantras on body parts) in Tantras, and breath moved through eighteen body points in the Yogayājñavalkya. They suggest the resolve stage was an innovation inspired by Western relaxation therapies, since medieval yogins sought to remove intention.

iRest and use in veterans' services

iRest (Integrative Restoration) was developed by the clinical psychologist Richard Miller. The iRest Institute describes it as based on yoga nidra and adapted to modern life, and says it was endorsed by the US Army Surgeon General, a claim this page could not confirm from an independent source. A peer-reviewed report describes a Washington DC Veterans Affairs programme offering iRest since 2007, taught by instructors trained under Miller.

Yoganidrā, yoga nidra and Nidra Yoga

Yoganidrā combines yoga with nidrā, meaning sleep. Birch and Hargreaves note that the compound can be read as the sleep that is yoga, the sleep caused by yoga or the sleep of yoga. Satyananda glossed it as psychic sleep or deep relaxation with inner awareness. Research papers use the spellings yoga nidra and yogic sleep. This page is titled Nidra Yoga, a form the sources reviewed do not use.

One word, several meanings

The same word refers to a deity's sleep, a goddess, the meditative state of samādhi in medieval yoga texts, a posture and a modern guided practice. Birch and Hargreaves add that Advaita Vedānta texts speak of a fourth state, turīya, beyond waking, dreaming and deep sleep, but rarely use the term yoganidrā. A medieval reference to yogic sleep should therefore not be read as a description of the modern guided session.

iRest, Non-Sleep Deep Rest and unspecified protocols

The iRest Institute presents iRest as a ten-step protocol adapted from yoga nidra. A 2025 meta-analysis describes iRest and Non-Sleep Deep Rest as adaptations that remove religious or mystical elements. Among its 73 studies, 38 followed the Bihar School guidance, 11 used iRest, one used another teacher's version and 23 did not say which method was used, so trials labelled yoga nidra may test different protocols.

Session format

Research reviews describe yoga nidra as typically led by an instructor, with participants lying supine and following spoken guidance. Satyananda's method, as summarised by Birch and Hargreaves, has seven parts: preparation in śavāsana, a resolve (saṅkalpa) stated as a short positive intention, rotation of consciousness through the body, awareness of the breath, pairing of opposite feelings and sensations, visualisation, and repeating the resolve while returning to waking.

Delivery in studies and clinics

The VA programme in Washington describes iRest as group guided meditation using breathing, body sensing, imagery and progressive relaxation. A US pilot for women used 90-minute sessions twice a week for ten weeks. Across 73 studies, the 2025 meta-analysis found training ranging from a single 30-minute session to 4,550 minutes over 26 weeks, and 20 studies did not report whether an instructor was present.

Teacher training

The iRest Institute runs its own certification: a 30-hour Level 1 course, a 30-hour Level 2 course, two retreats, 200 hours of self-study and supervision, with a code of ethics and scope of practice. The sources reviewed identified no independent or statutory training standard specific to yoga nidra, so the qualification of a teacher depends on the school or organisation that trained them.

Claims made within the tradition and by providers

Satyananda described yoga nidra as one aspect of pratyāhāra, withdrawal of the senses, leading to concentration and samādhi, and said that pairing opposite sensations harmonises the brain's hemispheres. These are his statements, not tested findings. A narrative review reports that advocates claim it reduces stress, increases receptivity to personal resolutions and improves physiological and mental health. The iRest Institute lists sleep, stress, trauma, depression, anxiety and chronic pain.

Outcomes that have been studied

Research has examined stress, anxiety and depression, sleep, pain, post-traumatic stress symptoms in veterans and, in one pilot, functional dissociative seizures. Studying a use does not show that the practice helps with it. The sources reviewed do not document why people seek the practice in everyday life, so this section records provider claims and research targets only.

Stress, anxiety and depression

A 2025 systematic review and meta-analysis included 73 studies with 5,201 participants, about two thirds of them in India. Against active comparators, pooled effects were Hedges g -0.80 for stress, -1.35 for anxiety and -0.69 for depression. Against no comparator they were larger. Of 22 randomised trials, 17 were at high risk of bias and five had some concerns; the authors say the estimates are probably inflated.

Sleep

A 2026 meta-analysis of five unique studies in people with poor sleep or insomnia found non-significant pooled effects in randomised trials (PSQI, n = 181; ISI, n = 99) and rated certainty very low. A 2025 review of six randomised trials (244 people) reported improvements in sleep onset, total sleep time and efficiency against controls such as cognitive behavioural therapy for insomnia, but most trials had moderate or high risk of bias and adverse events were poorly reported.

Pain

A 2025 meta-analysis of 12 studies (1,176 participants) found lower pain than passive comparators (g -2.05) but no significant difference against active comparators (g -0.31), with no clear dose-response pattern. The authors rated methodological quality low and said the effects may be inflated.

iRest pilots in veterans, and a null trial

A qualitative feasibility study of eight weekly iRest classes in 16 combat veterans with PTSD (11 completed) reported less rage and anxiety but also difficulty with focus and intrusive memories. A VA pilot in women with sexual trauma had 10 completers and no control group. A 2026 pilot trial in 50 people with functional dissociative seizures found no significant benefit of adding yoga nidra to psychoeducation compared with sham yoga nidra (p = 0.88).

Reporting of harms

A systematic review of sleep trials found adverse events and safety data were reported inaccurately or not at all. A broader review of 83 meditation studies, which excluded yoga postures and was not specific to yoga nidra, found at least one adverse event in 65 per cent of studies, with anxiety, depression and cognitive anomalies the most common. Its pooled prevalence was 8.3 per cent, higher in observational than experimental studies.

Trauma and guidance

The 2025 meta-analysis notes that because sessions can involve visualising memories and emotions, improper guidance could have retraumatising effects, and it argues for trained instructors. This is the reviewers' reasoning, not an incidence figure. In the iRest feasibility study, veterans with PTSD reported intrusive memories during the programme, and a participant may pause, ask questions or stop a session.

Care boundaries

Guided relaxation does not replace assessment or prescribed treatment for insomnia, pain, depression, post-traumatic stress or seizures. Worsening distress, thoughts of self-harm, flashbacks or a seizure during or after a session are reasons to seek medical or mental health care.