NSDR, or Non-Sleep Deep Rest, is a term coined by Stanford neuroscientist Andrew Huberman for a category of practices, most directly based on yoga nidra, a guided relaxation practice from yoga, that bring the body into deep rest while staying conscious. Research shows genuine, if often modest, benefits: yoga nidra practices are linked to reduced cortisol and improved subjective sleep quality across several studies. Where the popular narrative outruns the evidence is the widely repeated claim that NSDR boosts dopamine by 65 percent, that figure traces back to a single small study from 2002 involving just 8 experienced practitioners, not a large modern trial. NSDR is a genuinely useful relaxation tool, but it’s not a substitute for actual sleep. This is educational information, not medical advice.
From the Practice
[RILEY: add a real observation here, for example how clients typically respond to their first NSDR session, or a specific way you use it differently from a bedtime wind-down routine.]
What Is NSDR, Really?
NSDR is essentially a rebrand of yoga nidra, a centuries-old guided relaxation practice, sometimes called “yogic sleep.” Andrew Huberman has said publicly that the term was coined partly to make these practices more accessible to people who might resist yoga or meditation for cultural or religious reasons. The physiological goal between NSDR and yoga nidra is the same: guiding your nervous system into a deeply relaxed state without falling all the way asleep. You may also see this described as a body scan, guided relaxation, or sleep hypnosis, all describing closely related practices. Sleep researchers describe wakefulness and sleep less as a strict binary and more as a spectrum, with NSDR occupying a distinct middle zone.
How Do You Practice NSDR?
The practice itself is simple and requires no equipment:
- Lie down in a comfortable position, typically flat on your back with arms relaxed at your sides.
- Follow a guided audio session, most people use a recorded script rather than practicing unguided, especially when starting out.
- Bring attention through the body, guided sessions typically walk your awareness through different body parts and use breath awareness to deepen relaxation.
- Stay in the practice for 10 to 30 minutes. Shorter sessions (10-20 minutes) are common for a midday reset; longer sessions (30-60 minutes) are sometimes used to help recover from a poor night’s sleep.
- Let yourself drift toward, but not into, sleep. Falling asleep occasionally during practice isn’t a failure, but the goal is to stay in that conscious, deeply relaxed middle state.
Does NSDR Actually Boost Dopamine by 65 Percent?
This is worth examining closely, because it’s one of the most frequently repeated claims about the practice, and the evidence behind it is much thinner than the way it’s usually presented. The claim traces back to a single study from 2002, in which researchers used PET scans to measure dopamine activity in 8 experienced yoga practitioners during yoga nidra. They found a 7.9 percent decrease in radiotracer binding in the brain’s ventral striatum, which the researchers calculated corresponds to roughly a 65 percent increase in endogenous dopamine release compared to a resting baseline.
That’s a real, legitimately interesting finding, it was the first study to demonstrate this kind of neurotransmitter change during a conscious meditative state. But it’s a single study, with only 8 participants, all of whom were highly experienced practitioners rather than beginners, and it hasn’t been replicated at scale in the more than two decades since. Treating “NSDR increases dopamine by 65 percent” as an established, generalizable fact significantly overstates what one small 2002 PET study actually supports.
What Does the Research Say About Cortisol and Sleep, Specifically?
This is where the evidence is somewhat more current and better replicated, though still developing. A 2025 randomized study published in the journal Stress and Health found that online yoga nidra sessions, in both an 11-minute and a 30-minute format, positively influenced diurnal salivary cortisol patterns and subjective well-being. Broader reviews of yoga nidra research spanning roughly 20 years report consistent reductions in stress, anxiety, and depression symptoms, but the same reviews are candid that many of these studies rely on small samples and self-reported outcomes rather than objective physiological measures, meaning the effects, while promising, aren’t yet considered firmly established.
At a Glance: NSDR / Yoga Nidra Research
| Claim | What the Evidence Actually Shows |
|---|---|
| “65% dopamine increase” | Real finding, but from a single 2002 PET study of 8 experienced practitioners, never replicated at scale |
| Reduced cortisol | Supported by a 2025 randomized study on online yoga nidra sessions affecting diurnal cortisol patterns |
| Reduced stress, anxiety, depression | Consistently reported across ~20 years of studies, though many have methodological weaknesses (small samples, self-report) |
| Distinct neurological state | A 2024 study found yoga nidra produces functional brain connectivity patterns distinct from both ordinary wakefulness and sleep |
Is NSDR a Substitute for Actual Sleep?
No, and this is an important honest distinction. NSDR can occasionally help you recover some sense of rest after a poor night, and a 2024 study found it produces a genuinely distinct pattern of brain connectivity compared to both normal wakefulness and sleep. But it doesn’t replicate the full sleep cycle your body needs for physical repair, immune function, and memory consolidation. It’s a complement to good sleep, a tool for daytime nervous system regulation, not a replacement for it.
If a racing nervous system is making it hard to wind down at night even with tools like NSDR, book a consultation with The Sleep Consultant so we can look at the fuller picture.
What the Research Shows
The viral “65% dopamine increase” claim comes from a single small study, not a large modern trial. A 2002 PET study of 8 experienced yoga practitioners found a calculated 65 percent increase in dopamine release during yoga nidra, a genuine and interesting finding, but one based on a tiny sample that hasn’t been replicated at scale in over two decades.
More recent, better-designed research supports a cortisol-lowering effect. A 2025 randomized study found that online yoga nidra sessions positively influenced diurnal salivary cortisol patterns and subjective well-being, offering more current, replicated support than the dopamine claim.
Broader stress and mood benefits are consistently reported but not yet firmly established. Reviews spanning roughly 20 years of yoga nidra research report consistent reductions in stress, anxiety, and depression, while candidly noting that many studies rely on small samples and subjective self-report rather than objective measures.
NSDR produces a neurologically distinct state, but isn’t a substitute for sleep. A 2024 study found yoga nidra practice creates functional brain connectivity patterns different from both ordinary wakefulness and sleep, supporting its value as a genuine relaxation tool, though it doesn’t replace the physiological functions of actual sleep.
This article is for educational purposes only and is not a substitute for personalized medical advice, diagnosis, or treatment.
Want More Nervous-System Tools for Better Sleep?
Join the free Sleep Nirvana Club course and community for practical, root-cause-first guidance: Join here
When to Seek Professional Help
- You’ve practiced NSDR consistently for several weeks with no noticeable change in stress or sleep
- You have a trauma history, unguided deep-relaxation practices can sometimes surface difficult material, and working with a therapist first is a reasonable precaution
- You’re using NSDR as a substitute for addressing chronic insomnia rather than a complement to treating it
- You experience significant daytime sleepiness that might indicate an underlying sleep disorder, such as sleep apnea, rather than simple stress
- Persistent low mood or anxiety symptoms accompany your sleep difficulties
Frequently Asked Questions
Is NSDR the same thing as yoga nidra?
Essentially, yes. NSDR is Andrew Huberman’s term for practices based primarily on yoga nidra, a traditional guided relaxation practice, reframed without the spiritual or cultural language to make it more accessible to a broader audience. The underlying neurological mechanisms are considered nearly identical.
Does NSDR really increase dopamine by 65 percent?
That specific figure comes from a single 2002 PET study of just 8 experienced yoga practitioners, a real and interesting finding, but one small study that hasn’t been replicated at scale since. It’s more accurate to say NSDR may support dopamine activity based on limited early evidence, rather than treating the 65 percent figure as an established, generalizable fact.
Can NSDR replace sleep if I’m sleep-deprived?
No. While NSDR may help you feel more rested and has been shown to produce a distinct, restful brain state, it doesn’t replicate the physical repair, immune function, and memory consolidation that actual sleep provides. It’s best used as a complement to good sleep, not a substitute for it.
Does NSDR actually lower cortisol?
There’s reasonably good, fairly recent evidence for this. A 2025 randomized study found that online yoga nidra sessions positively influenced diurnal cortisol patterns, adding more current support to this specific claim compared to some of the other benefits attributed to the practice.
How long should an NSDR session be?
Sessions commonly run 10 to 20 minutes for a general reset, with longer sessions of 30 to 60 minutes sometimes used specifically to help recover from a poor night’s sleep. There’s no single required length, consistency of practice appears to matter more than session duration.
When to Work With a Sleep Consultant
NSDR is a genuinely useful nervous-system regulation tool with real, if sometimes overstated, evidence behind it. If stress and a wired nervous system are consistently getting in the way of your sleep despite tools like this, it’s worth understanding the fuller root cause.
