Quick answer: The vagus nerve is the main nerve of your body's "rest and digest" system. When it's more active, your heart rate slows and your body shifts out of stress mode toward the calmer state that sleep depends on. Habits like slow breathing and regular exercise are the best-supported ways to raise vagal activity. Devices like the Sensate 2, which uses gentle low-frequency vibration, are designed to help you relax in 10-to-30-minute sessions, but evidence for the device itself is so far limited to small, company-linked studies.

What is the vagus nerve?

The vagus nerve is the longest cranial nerve in the body. It runs from your brainstem down through your neck and chest and into your abdomen, reaching your heart, lungs, and digestive tract along the way. Its name comes from the Latin word for "wandering" (Kenny & Bordoni, StatPearls).

It's the major nerve of the parasympathetic nervous system, often called the "rest and digest" system, which counterbalances your "fight or flight" stress response. One of its key jobs is slowing your heart rate.

In short: the vagus nerve is one of the body's built-in tools for calm, and calm makes it easier to fall asleep.

How does the vagus nerve affect sleep?

This section and the next three cover general physiology and lifestyle research, not the Sensate device.

Falling asleep isn't something you can force. It happens as your nervous system shifts from alertness toward rest. Research measuring heart rhythms shows that as people fall asleep and move into non-REM sleep, the balance shifts toward "rest and digest," with vagal activity rising. In REM (dreaming) sleep, it swings back toward waking levels (Trinder et al., J Sleep Res, 2001).

Here's what that shift looks like:

• Your heart rate slows. Vagal activity is the main brake on your heart rate at rest.
• Your breathing slows and deepens. Slow breathing with a long exhale in turn increases vagal activity, so the two reinforce each other (Laborde et al., 2022).
• Your stress response quiets. Higher vagal activity is linked with a calmer stress-hormone profile, and researchers think the vagus helps rein in the body's stress response, though its direct effects on hormones like cortisol are still being studied (Thayer & Sternberg, 2006).
• Your body enters recovery mode. Digestion and other restorative processes are part of the "rest and digest" state.

Stress and a nervous system stuck in "on" mode can make it harder to wind down. For many people with chronic insomnia, this kind of hyperarousal is a big part of the picture (Riemann et al., Sleep Med Rev, 2010). But poor sleep has many causes, including sleep apnea, pain, body-clock and schedule problems, caffeine or alcohol, medications, and mood disorders (NHLBI). Sleep apnea alone affects an estimated 936 million adults worldwide, most of them undiagnosed (Benjafield et al., Lancet Respir Med, 2019). If your sleep problems persist, talk to a doctor.

What is "vagal tone" and why does it matter for sleep?

"Vagal tone" is shorthand for how much the vagus nerve is calming your heart at rest. It can't be measured directly, so it's estimated through heart rate variability (HRV), the small beat-to-beat changes in your heart rhythm, especially those tied to breathing (Laborde, Mosley & Thayer, 2017). HRV is a useful but imperfect proxy: breathing, age, fitness, medications, and the measuring device all affect it.

Does higher vagal tone mean better sleep? The evidence is mixed. Some studies find that people with insomnia show lower vagal activity around bedtime (Ma et al., 2024), but a review of 22 studies couldn't confirm that HRV is reliably lower in insomnia (Dodds et al., Sleep Med Rev, 2017). These studies show associations, so it's not clear whether low vagal tone causes poor sleep or the reverse.

The encouraging part is that HRV isn't fixed. Regular exercise and slow-breathing practice can raise it for many people, though how much varies, and age and genetics set limits.

How can you naturally support your vagus nerve?

Here's what the research says about common approaches, from strongest evidence to weakest:

• Slow breathing with long exhales. Breathing at about six breaths a minute, with an exhale longer than the inhale, reliably raises HRV while you do it (Laborde et al., 2022; Van Diest et al., 2014). Small trials suggest a nightly practice may modestly improve sleep: in one, 15 minutes a night for 30 days improved self-rated sleep quality in 64 young adults (Laborde et al., 2019). Try breathing in for a count of four and out for six to eight in the hour before bed.
• Regular movement. Regular aerobic exercise is one of the best-supported ways to raise resting HRV (Sandercock et al., 2005). Consistency matters more than intensity.
• Cold water on the face. Cold on the face triggers the diving reflex, a brief, vagus-driven slowing of the heart (Godek & Freeman, StatPearls). It may help you feel calmer in the moment, but there's little evidence that it trains your nervous system long-term. If you have a heart condition, check with your doctor first.
• Humming, singing, or chanting. These naturally slow and lengthen your exhale, which may explain the small HRV increases seen in a handful of small studies (Bernardi et al., BMJ, 2001). Evidence that they stimulate the vagus nerve beyond that is limited.
• Mindful downtime and good sleep habits. Meditation, time outdoors, a consistent bedtime, and less screen time in the evening are all reasonable ways to help your body wind down.

The Sensate 2: what it is, and what the evidence shows

Reminder: Dryft sells this device.

Building better habits is the foundation. But at the end of a long, frazzled day, a 20-minute breathwork practice can feel like one more thing on the list. That's where some people turn to a device like the Sensate 2.

What it is: The Sensate 2 is a palm-sized device you rest on your chest. According to the manufacturer, it emits low-frequency sound waves felt through your chest by bone conduction, paired with soundscapes you listen to through headphones in the Sensate app. Sensate describes this as "acoustic" vagus nerve stimulation and says it doesn't electrically stimulate the nerve. Sessions run from 10 to 30 minutes (Sensate).

What the evidence shows so far: As of October 6, 2026, we found no peer-reviewed study of the Sensate device.

• Sensate's own study, run by Sensate and not peer-reviewed, followed 25 adults who used the device daily for two weeks, with no comparison group. Participants reported lower stress and anxiety and better sleep on questionnaires (Sensate study report).
• A separate pilot by a research lab, not published in a journal, measured 40 people during a single 20-minute session. Heart rate fell in about two-thirds of participants, by about 5 beats per minute on average (White Mirror case study). There was no sham or comparison condition, so it can't separate the device's effect from simply lying down and relaxing.
• Neither study measured vagal activity or HRV against a control, so there isn't yet direct evidence that the device "calms the vagus nerve" or improves sleep beyond what participants reported.
• The Sensate 2 isn't FDA-cleared. It's sold as a consumer wellness device.

Why we carry it anyway:

• It's easy to use. You lie back, it hums softly against your chest, and there's no technique to master, which some people find easier to stick with than breathwork.
• It's built around a sound idea. The approach draws on the same relaxation physiology described above, even though the device-specific evidence is still early.
• It's versatile. Use it before bed, while traveling, or for a mid-day reset.
• It's portable. It's small enough to keep on your nightstand or carry in a bag.

If stress or a racing mind is part of what keeps you up, the Sensate 2 is one tool to try alongside the habits above. It isn't a substitute for them or for medical care.

Price and purchase terms: The Sensate 2 is $299, or $348 with the Sensate Plus pack. It may be eligible for purchase with HSA/FSA funds through Burst; eligibility depends on completing a health questionnaire and being approved. Returns are covered by our refund policy; please review its terms before buying.

The bottom line

Better sleep isn't only about what you do in bed. It's also about the state your nervous system is in when your head hits the pillow. The vagus nerve helps shift your body from stressed to settled, and slow breathing and regular exercise are the best-supported ways to support it. Devices like the Sensate 2 offer an easy, hands-off way to relax, though evidence for the device itself is still limited.

Take care of your body, and give your nervous system a chance to wind down before bed.

Frequently asked questions

Can you really stimulate the vagus nerve to sleep better?

Slow breathing reliably increases vagal activity while you do it, and small trials suggest a nightly slow-breathing practice may modestly improve sleep quality (Laborde et al., 2019). Evidence for other methods, including vibration-based devices like the Sensate 2, is more limited.

How long does it take to calm the vagus nerve?

It varies. Small studies show that even a single session of slow breathing with long exhales can reduce anxiety in the moment (Magnon et al., 2021). In a month-long study, five minutes a day of "cyclic sighing" improved mood (Balban et al., 2023). Effects are modest and vary from person to person. Sensate recommends 10-to-30-minute sessions with its device.

What is the Sensate 2 and how does it work?

The Sensate 2 is a chest-worn device that, according to the manufacturer, uses low-frequency sound waves delivered through bone conduction and paired with app soundscapes to help you relax. Sessions run 10 to 30 minutes. Evidence so far comes from small, unpublished, company-linked studies, and it isn't FDA-cleared. Dryft sells the device.

Is supporting the vagus nerve a substitute for medical care?

No. Vagus nerve practices and calming tools can support stress management and healthy sleep habits, but they aren't a treatment for medical conditions. If you have chronic insomnia, anxiety, loud snoring, or another health concern, talk with a healthcare provider.

Disclosure: Dryft Sleep sells the Sensate 2 device discussed in this article, so we have a financial interest if you buy it. We've linked our sources and kept the general science separate from the evidence for the device.

This post was updated October 6, 2026 by Dryft Sleep.