By Dr. K. Nicole Mims, board-certified sleep physician
This June at SLEEP 2026, the big national sleep medicine conference, I got a hands-on demo of a Belgian-made gadget called the Moonbird. What I like about it is that it's a simple, intuitive way to guide deep breathing exercises. So I looked at the data.
TL;DR: the breathing science behind it is solid, and the Moonbird-specific research is still early, but I think it’s a solid choice especially for going back to sleep. It’s an opportunistic intervention to return your nervous system closer to sleep state and something to reach for instead of your phone when you hit that crescendo of I’m awake… I’m awake… I’M AWAKE.
What it is
Moonbird is a device you hold in the palm of your hand. It expands, and you breathe in. It contracts, and you breathe out. There's no screen and no counting.
When you try deep breathing on your own at night, it's easy to second-guess yourself. Was that four counts or five? Am I doing this right? That second-guessing fires up the exact mental state that keeps you awake. Moonbird does the counting for you, and it gives you feedback through your fingertips and hand, so it doesn't depend on a screen, light, or sound.
You can add optional audio guidance, set how long you want to go, or let the app work out a breathing rhythm based on your heart rate, which a thumb sensor reads. It also works completely on its own. There's an app with tracking numbers if you want it, but I think it's important to keep screens out of the bedroom, so I wouldn't use it. No screen, no numbers, just breathe.
Why it might help
When you're awake, your sympathetic nervous system, your fight-or-flight side, is in charge. To fall asleep, it hands control over to your parasympathetic side, your rest-and-digest system. With insomnia, a lot of people get stuck with that fight-or-flight side running too high and the rest-and-digest side running too low, so sleep doesn’t come.
Slow, deep breathing, around six breaths a minute, helps turn the fight-or-flight side down and the rest-and-digest side up. A 2022 review and meta-analysis of 223 studies found that voluntary slow breathing increases heart rate variability, a marker of that rest-and-digest activity. And the American Academy of Sleep Medicine's 2021 guideline on behavioral treatments for chronic insomnia includes relaxation therapy as a treatment option. Moonbird is basically trying to tap into that.
The Moonbird study: 39 people, one month
The Moonbird-specific evidence comes down to one published pilot study (Vermeylen et al., Frontiers in Digital Health, 2022). 39 adults with self-reported sleep problems used the device at home for about four weeks and filled out sleep questionnaires before and after.
What they found:
Sleep quality scores on the Pittsburgh Sleep Quality Index (PSQI) improved by about 3 points on average.
People also rated their sleep as more refreshing afterward.
Most found it easy to use and would recommend it to friends and family.
Limitations of the study include:
No comparison group. Nobody got a sham device, so we can't separate the device from simply paying attention to your sleep for a month.
All results were self-reported. There was no sleep study or other objective measure.
Two of the five authors are from Moonbird (a co-founder and a researcher). The authors disclose this, and it doesn't make the results wrong, but it's worth noting.
What the evidence shows, and what it doesn't
✅ Slow-paced breathing shifts the nervous system toward rest-and-digest (large body of research)
✅ Relaxation techniques are part of the AASM's insomnia guideline
✅ People found Moonbird easy to use, and self-reported sleep quality improved in one small study
❌ A controlled trial showing Moonbird itself improves sleep
❌ Objective sleep measurements with Moonbird
❌ Independent studies without company involvement
What users didn't love
To the study's credit, it reported the gripes too. Some people said the breathing motion could be easier to feel. About a third (12 of 39) found it somewhat or truly too large for their hand. A couple of people said the device's noise could be quieter.
On the plus side, one participant said the guided audio kept their mind from wandering, and that helped them fall asleep faster than the raindrop or whale sounds other sleep apps use.
Possible side effects
It’s non-pharmacologic, so side effects are limited. But any kind of breathing exercise can cause lightheadedness or tingliness if you breathe too hard or too fast, so be cautious about that. If you get short of breath, ease off using the device. If you have panic attacks, focusing on your breathing can sometimes make things worse, so go slow.
How I'd use it
I think the best time to reach for this is when you've done everything you normally do to fall asleep, or especially to get back to sleep, and you start to feel yourself ramping up because you're frustrated that sleep isn't coming. That "I'm about to be wide awake if I don't do something different" cliff. Instead of reaching for your phone, reach for the Moonbird.
I don't think it's going to be the magic fix for someone with nightly insomnia who struggles to fall asleep in most situations, although it could help as a complementary tool.
What's next for the research
A randomized trial of the device has been registered in Belgium (ClinicalTrials.gov NCT06475378), with about 72 adults with insomnia, a sham-device comparison group, and objective sleep measurement. I haven't found published results yet but I’m eager to see the results.
Bottom line
Moonbird is a well-designed, screen-free way to do slow breathing, and slow breathing is a reasonable thing to do when your body is revved up at bedtime. The Moonbird-specific evidence is one small, uncontrolled, partly company-run study with self-reported results, but it’s based on a large body of evidence that breathing exercises can turn down an overexcited nervous system. It's about $180 (listed at $179.99), the company lists it as HSA/FSA eligible, and it comes with a 30-day trial. If you'd rather try the free version first, breathe in for 4 and out for 6 for about 10 minutes. And there’s a kid version called the Moonbuddy which seems promising and a good alternative to medication for kids.
Disclosure: I have no financial relationship with Moonbird. This review is not sponsored or paid. Moonbird provided product photos but had no input into or approval over this content. I tried the device at a demo at SLEEP 2026.
This post is for education only and is not medical advice. Talk with your own clinician about your sleep.
References
Vermeylen S, Honinx E, Broes S, Vandenhoudt H, De Witte NAJ. Evaluation of a tactile breath pacer for sleep problems: a mixed method pilot study. Frontiers in Digital Health, 2022;4:908159. DOI 10.3389/fdgth.2022.908159: https://www.frontiersin.org/journals/digital-health/articles/10.3389/fdgth.2022.908159/full
Laborde S, et al. Effects of voluntary slow breathing on heart rate and heart rate variability: a systematic review and a meta-analysis. Neuroscience & Biobehavioral Reviews, 2022;138:104711. DOI 10.1016/j.neubiorev.2022.104711
Edinger JD, et al. Behavioral and psychological treatments for chronic insomnia disorder in adults: an American Academy of Sleep Medicine clinical practice guideline. Journal of Clinical Sleep Medicine, 2021;17(2):255–262. DOI 10.5664/jcsm.8986: https://pmc.ncbi.nlm.nih.gov/articles/PMC7853203/
ClinicalTrials.gov NCT06475378. Enhancing Sleep Onset: the Power of Tactile Breath Pacer in Cognitive Behavioral Therapy for Insomnia: https://clinicaltrials.gov/study/NCT06475378
Moonbird product page (price, HSA/FSA, 30-day trial): https://www.moonbird.life
Video: Moonbird Review: Does the Breathing Device Hold Up? A Sleep Physician's Look at the Evidence. https://youtu.be/z3SrzQFn8zg
If trouble sleeping has become a pattern, I see patients in Alabama and North Carolina by telehealth. You can book a visit here.