Tip · Sleep

NSDR and Yoga Nidra

Guided relaxation lying down, during which you stay awake. A meta-analysis of 73 studies with 5,201 participants found markedly less stress, anxiety and depressiveness, but itself considers the effects overestimated because of weak study quality. On sleep, the studies are small; the first meta-analysis rates their certainty as very low.

Lie down, listen, stay awake: Yoga Nidra is a guided deep relaxation that has been taught for decades and has found a new following as Non-Sleep Deep Rest, NSDR for short. The body of studies is broader than many assume, and at the same time less robust than the large effect sizes suggest.

In short

Yoga Nidra has been researched a lot, though mostly in small studies. Across 73 studies with 5,201 participants, stress, anxiety and depressiveness fell markedly, but the authors consider the effects overestimated because of weak methodology. On sleep, one randomized trial with 144 heart patients stands out: sleep efficiency of 82 instead of 64 percent, measured by motion sensor. The first meta-analysis on sleep, by contrast, finds no established effect. A single 10-minute session makes you feel fresher and less stressed, but does not come close to a 25-minute nap.

What NSDR and Yoga Nidra are

Yoga Nidra, translated “yogic sleep”, is a simplified form of an old tantric relaxation technique. You lie on your back, in the corpse pose Shavasana, and follow a voice that guides you through breath, body awareness and inner images. The goal is deep relaxation with consciousness preserved, and this is exactly where the state differs from sleep. The practice was systematized and popularized in the 1960s by Swami Satyananda Saraswati; it includes a personal resolution, the Sankalpa.

NSDR is the newer, secular name for the same core. In the studies on it, it is described as a short guided relaxation with slow breathing and step-by-step body awareness, without a spiritual framework. Anyone who already knows the body scan from mindfulness meditation will recognize a lot; the difference is lying down and the intention of getting to the threshold of falling asleep.

What happens in the body

The best-known measurement dates from 2002. Using a radioactively labeled tracer in a PET scanner, a research group compared Yoga Nidra with simple listening with eyes closed. During the practice, binding of the tracer in the ventral striatum fell by 7.9 percent, which the authors converted into 65 percent more released dopamine. At the same time, theta activity in the EEG increased, and all participants described less urge to act and more vivid inner images. The perceived depth of relaxation, by contrast, did not differ between the two conditions.

Newer measurements are more sober. In a randomized trial with 102 young adults, heart rate fell more during a 10-minute NSDR session than in the control group, and skin temperature rose less. The authors themselves call these physical findings modest. More on heart rate variability as a measure is on the page on HRV measurement.

What is well supported

The effect on well-being is the best supported. Across 73 studies with 5,201 participants, stress, anxiety and depressiveness fell, also compared with active comparison groups. A single 10-minute session improved sleepiness, fatigue, stress and the feeling of recovery in a randomized trial with 102 participants. And in heart patients with poor sleep, sleep efficiency measured by motion sensor was 82 percent after twelve weeks of Yoga Nidra, compared with 64 percent in the comparison group.

What the studies show

Meta-analysis on stress, anxiety and depressiveness, 2026

Of 814 hits, 73 studies with 5,201 participants remained. Compared with active comparison groups, the effect sizes were −0.80 for stress, −1.35 for anxiety and −0.69 for depressiveness, and even higher compared with groups without intervention. The authors themselves write that these moderate to large effects are probably inflated because of the low methodological quality and inconsistent implementation.

First meta-analysis on sleep, 2026

Preregistered; adults with poor sleep or insomnia were included. In the end, the data were sufficient only for three very small subanalyses from five studies. Two randomized trials with 181 participants showed a large but not significant effect on the sleep quality questionnaire, and two randomized trials with 99 participants likewise no established effect on the insomnia index. The authors rate the certainty of the evidence as very low; the studies come predominantly from India.

Systematic review of the randomized sleep studies, 2026

Six randomized trials with a combined 244 participants, including people with chronic and acute insomnia, high blood pressure, health care workers during the pandemic and athletes. Most reported shorter time to fall asleep, longer sleep and higher sleep efficiency, also compared with comparison methods such as progressive muscle relaxation and music. The risk of bias was mostly moderate to high, and side effects were barely reported.

Yoga Nidra Trial in heart patients, 2026

Randomized trial with blinded assessment in 144 people with stable coronary heart disease and poor sleep, 72 per group, all with sleep hygiene counseling. The Yoga Nidra group practiced a 35-minute session for twelve weeks. Measured by motion sensor, sleep efficiency afterwards was 82 versus 64 percent, total sleep time 357 versus 298 minutes, and time to fall asleep 15 versus 30 minutes. Stress, depressiveness and quality of life also improved.

Online study with 362 participants, 2025

For two months, daily if possible, via audio file: 11 minutes of Yoga Nidra, 30 minutes of Yoga Nidra, 10 minutes of music as an active control, or a waiting list. The short form improved well-being compared with the waiting list with small effect sizes of 0.08 to 0.16 and lowered depressiveness more than music. Regular practice was associated with lower total cortisol in saliva; the long form worked somewhat more strongly than the short one.

One session, 10 minutes, 2026

102 physically active young adults, randomly assigned to 10 minutes of guided NSDR or a control condition. Sleepiness, fatigue, stress and lack of drive decreased, and perceived mental performance and recovery increased. Reaction time was better immediately afterwards, but no longer 20 minutes later. Jump power and grip strength remained unchanged.

NSDR versus a nap, 2026

The same research group compared 60 young adults: a 25-minute opportunity to sleep, 10 minutes of NSDR, or control, 20 per group. After 40 minutes, the nap group felt less tired and more ready to perform, also compared with the NSDR group. For NSDR, this study found no effect on any endpoint.

Measured in the sleep laboratory, 2021 and 2023

In a randomized trial from 2012 to 2016, 41 patients with chronic insomnia received either cognitive behavioral therapy or Yoga Nidra. Both groups afterwards slept longer and lay awake for shorter periods; under Yoga Nidra, the proportions of sleep stages N2 and N3 increased markedly, and salivary cortisol fell. A second study measured, in 41 beginners after four weeks of practice in the sleep laboratory, a 3.6 percent higher sleep efficiency and 20 minutes less wake time after falling asleep, but without a control group.

What users report

A research group had 33 adults, 80 percent of them with insomnia, practice a 30-minute session in a group and then interviewed them in focus groups. Negative mood fell by 31 percent, positive mood by 13 percent, which fits a calmer, less driven state. The conversations revolved around three themes: deep relaxation and the feeling of having slept, the withdrawal of the senses, and the hope of using the practice against sleep problems, anxiety and pain. Whether someone wanted to continue depended, according to the reports, on the type of guidance and on personal factors.

Where the data stop

There are many studies, but few robust ones. The large meta-analysis on stress and anxiety is based on studies of low methodological quality, and its own authors consider the effects inflated. On sleep, the first meta-analysis was only enough for three mini-analyses with two studies each, without an established effect and with very low certainty. The studies come predominantly from India, and practically none is blinded, because anyone practicing knows it.

There is no evidence for the formula “10 minutes of NSDR replace sleep”. In direct comparison with a nap, NSDR had no effect, and the acute improvement in reaction time did not last 20 minutes. The often-cited 65 percent more dopamine comes from a single PET study from 2002; it describes a conversion during the practice, not a store that is replenished afterwards.

How to do it

Lie on your back, arms loosely beside your body, eyes closed, and use spoken guidance, because all studies worked with guided recordings. The typical sequence: a few calm, slow breaths, then attention moves through the body part by part, without you changing anything. The goal is to stay awake while the body becomes as calm as when falling asleep.

On duration: the studies ran with 10 to 35 minutes. In the online study with 362 participants, even 11 minutes daily over two months showed small effects, 30 minutes somewhat larger ones; in the heart patients it was 35 minutes over twelve weeks. As a short break in the afternoon, a 10-minute session is pleasant, but a 25-minute nap made people fresher in direct comparison. In bed in the evening, you may fall asleep; that is not a mistake. More on sleep habits is on the pages on sleep and sleep hygiene and the evening routine.

Safety

Yoga Nidra is one of the gentlest practices there is: no breath holding, no exertion, you are lying down. The problem is the data, not the practice. The review of the sleep studies explicitly criticizes that adverse events were barely recorded. For meditation in general, it is now well established that anxiety, restlessness or intrusive memories can occur; more on this on the page on meditation. With a history of trauma or severe mental illness, getting started should therefore be discussed. Do not listen while driving or operating machinery.

BK-Score Thin human evidence

Human evidence		5
Mechanism		4
Safety data		6
Hype gap		4
Track record of use		8

Evidence 5: A meta-analysis of 73 studies with 5,201 participants found large effects on stress, anxiety and depressiveness, but itself considers them probably inflated because of low methodological quality; on sleep, there are six small randomized trials with a combined 244 participants, a meta-analysis with very low certainty and a randomized trial with 144 heart patients and sleep measured by motion sensor. Mechanism 4: What is documented is a more strongly falling heart rate during the practice and, in a single PET study from 2002, increased dopamine release in the ventral striatum; how this turns into recovery or better night sleep has not been studied. Safety 6: The practice takes place lying down without physical exertion, but the review of the sleep studies explicitly criticizes that adverse events were barely recorded. Hype 4: A dopamine measurement and the idea of being able to replace sleep have turned into a promise of recovery, yet in direct comparison with a 25-minute nap, a 10-minute NSDR session showed no measurable effect. Use 8: Yoga Nidra has been taught as a systematized practice since the 1960s and has been used in studies with heart patients, cancer patients, students and online. Direction mixed: subjectively consistently better, objectively in individual studies, as a short break no advantage over a nap.

The score rates the state of knowledge, not the effect. “Safety data 9” means well studied – not harmless.
Subjective assessment by Biohacking Kompakt based on published scoring rules – not a scientific rating and not a medical recommendation. Rules and all ratings (German)

Frequently asked questions about NSDR and Yoga Nidra

What is the difference between NSDR and Yoga Nidra?

At the core, none. Yoga Nidra is the traditional practice, systematized in the 1960s by Swami Satyananda Saraswati, with lying on the back, a guided journey through the body, inner images and a personal resolution. NSDR, Non-Sleep Deep Rest, is the newer, secular name for a short guided relaxation with slow breathing and step-by-step body awareness.

Does Yoga Nidra help with falling asleep?

Possibly, but the data are thin. The best single study, 144 heart patients with poor sleep, found after twelve weeks, by motion sensor, a time to fall asleep of 15 instead of 30 minutes and a sleep efficiency of 82 instead of 64 percent. The first meta-analysis on sleep, by contrast, found no established effect and rates the evidence as very uncertain.

Can NSDR replace sleep?

No. In a study with 60 young adults, a 25-minute nap made people less tired and more ready to perform; 10 minutes of NSDR showed no effect. In a second study with 102 participants, the participants did feel more recovered after NSDR, but the better reaction time had disappeared again after 20 minutes.

Is it true that Yoga Nidra increases dopamine by 65 percent?

The figure comes from a single PET study from 2002. During the practice, binding of a tracer in the ventral striatum fell by 7.9 percent, which the authors converted into 65 percent more released dopamine. This describes a state during the practice, not a store that is replenished afterwards, and it is a single investigation.

How long should a session last?

The studies worked with 10 to 35 minutes. In an online study with 362 participants, 11 minutes daily over two months showed small effects, 30 minutes somewhat larger ones. There is no tested minimum duration.

Sources

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Information only, not medical advice and not a usage recommendation. With pre-existing conditions and before major changes, consult a physician. Last updated: 2026-11-07.