Nighttime Anxiety: Why Anxiety Gets Worse at Night and How to Cope

Author: Dr. Timothy Rubin, PhD in Psychology

Originally Published: April 2026

Last Updated: April 2026

Simple breathwork and body-based exercises can activate your vagus nerve and help calm anxiety naturally.

Contents

• What Is the Vagus Nerve?
• What Is Vagal Tone — and Why Does It Matter for Anxiety?
• Your Nervous System's Three Modes
• 7 Vagus Nerve Exercises You Can Try at Home
• How Vagus Nerve Exercises Work Alongside Therapy
• Safety Tips to Keep in Mind
• Putting It All Together
• FAQ: Vagus Nerve Exercises for Anxiety

Your body has a built-in system for calming anxiety — and you can learn to activate it on demand. It's called the vagus nerve, and a growing body of research shows that simple techniques like slow breathing, humming, and even splashing cold water on your face can stimulate it to reduce stress and promote calm. The best part? These exercises are free, require no equipment, and many of them work within minutes.

In this article, we'll break down what the vagus nerve actually does, why it matters for anxiety, and walk you through seven evidence-based exercises you can start using today.

What Is the Vagus Nerve?

The vagus nerve is the longest nerve in your body. Its name comes from the Latin word for "wandering," which makes sense — it starts in your brainstem and travels all the way down through your neck, chest, and abdomen, connecting to your heart, lungs, stomach, and intestines along the way.

Think of it as a two-way communication highway between your brain and your body. About 80% of the signals it carries actually travel upward — from your organs to your brain — which means your body is constantly updating your brain on how things are going internally.

The vagus nerve is the main nerve of your parasympathetic nervous system, often called the "rest and digest" system. It's the counterbalance to the "fight or flight" stress response. When your vagus nerve is active, it slows your heart rate, calms your breathing, promotes digestion, and reduces inflammation. It's essentially your body's natural brake pedal for stress.

The vagus nerve also plays a key role in the gut-brain connection. Most of your body's serotonin — a chemical closely linked to mood — is produced in your gut, and vagal pathways relay those signals to your brain. That's one reason stress so often shows up as stomach discomfort.

What Is Vagal Tone — and Why Does It Matter for Anxiety?

Vagal tone refers to how active and responsive your vagus nerve is. Higher vagal tone means your parasympathetic system is doing a better job of keeping you calm. Lower vagal tone means your body may struggle to recover from stress.

You can actually measure vagal tone indirectly through something called heart rate variability (HRV) — the subtle, natural variation in timing between heartbeats. When you breathe in, your heart speeds up slightly. When you breathe out, your vagus nerve gently slows it down. Greater variation is a sign of stronger vagal activity — and research consistently links higher HRV to better emotional regulation and stress resilience.

Here's where it gets interesting for anxiety: a large meta-analysis found that people with anxiety disorders consistently show lower heart rate variability — meaning reduced vagal tone — compared to people without anxiety. In other words, anxiety isn't just "in your head." It shows up as a measurable difference in how your nervous system functions.

The encouraging news? Research also shows that vagal tone isn't fixed — it can be improved through regular practice. This creates what researchers describe as an "upward spiral": as your vagal tone improves, you become better at managing stress, which in turn supports even healthier vagal function.

Your Nervous System's Three Modes

To understand why vagus nerve exercises work, it helps to know the basic states your nervous system moves between. Polyvagal Theory, developed by neuroscientist Stephen Porges, offers a useful framework for thinking about this:

• Safe and social (ventral vagal state): You feel calm, connected, and present. Your vagus nerve is actively engaged, keeping your heart rate steady and your body relaxed. This is the state where you can think clearly, connect with others, and handle challenges.
• Fight or flight (sympathetic activation): When your brain detects a threat, your sympathetic nervous system takes over — heart rate spikes, muscles tense, breathing quickens. This is useful in genuine danger, but anxiety can trigger this response even when there's no real threat.
• Shutdown or freeze (dorsal vagal state): When stress becomes overwhelming, your system may go into a kind of "collapse" — feeling numb, disconnected, or frozen. If you've ever felt so overwhelmed that you just couldn't move or think, this may be what was happening.

Vagus nerve exercises aim to shift you back toward that calm, connected state — essentially strengthening the brake pedal that counteracts fight-or-flight activation. If you deal with hypervigilance or an overactive stress response, these techniques can be especially helpful.

A note on the science: While polyvagal theory is widely used in therapy and offers a practical way to understand nervous system states, some of its specific neuroanatomical claims remain debated among researchers. The good news is that the exercises themselves are supported by independent research regardless of the theoretical framework.

7 Vagus Nerve Exercises You Can Try at Home

Each of these techniques has research support for activating the vagus nerve and shifting your nervous system toward calm. Start with whichever feels most accessible to you.

Slow, deep breathing is the most well-studied vagus nerve exercise — and you can do it anywhere.

1. Slow, Deep Breathing

This is the most well-supported technique for vagal stimulation. A major review of over 200 studies found that slow-paced breathing significantly increases heart rate variability and produces lasting benefits with regular use.

The key is extending your exhale, which directly activates the vagus nerve. A 2018 review confirmed that breathing below 10 breaths per minute increases HRV and reduces self-reported anxiety.

How to try it: Breathe in slowly for 4 counts, then out for 6–8 counts. Aim for about 6 breaths per minute. Even 2–3 minutes can make a noticeable difference. Popular patterns include box breathing (4-4-4-4) and 4-7-8 breathing (inhale 4, hold 7, exhale 8).

Notably, a Stanford study found that just five minutes of daily breathing exercises with extended exhales was more effective at improving mood than mindfulness meditation alone.

2. Cold Water on the Face

This one works fast. Splashing cold water on your face triggers something called the mammalian diving reflex — an automatic response where your vagus nerve rapidly slows your heart rate and shifts your body toward parasympathetic dominance, with effects kicking in within about 30 seconds.

How to try it: Splash cold water on your face (focusing on the forehead and cheeks), hold a cold damp cloth against your face for 15–30 seconds, or briefly dip your face in a bowl of cold water. This can be particularly useful for grounding yourself during a panic attack or acute anxiety spike.

3. Humming, Chanting, or Singing

The vagus nerve runs right through your throat and directly innervates your vocal cords. When you hum, chant, or sing, the vibration mechanically stimulates vagal pathways — and the sustained exhalation naturally slows your breathing toward that optimal range. A classic study published in the BMJ found that both mantra chanting and rhythmic prayer naturally slowed breathing to about 6 breaths per minute and significantly improved cardiovascular rhythms.

How to try it: Try humming for 1–2 minutes, especially on the exhale. "Om" chanting, singing your favorite song, or even gargling water vigorously can all provide similar stimulation.

4. Gentle Yoga

Yoga combines several vagal activation pathways at once — slow breathing, rhythmic movement, and a focused relaxation response. A comprehensive review of 59 studies found that yoga increases HRV and shifts the nervous system toward parasympathetic dominance. Researchers have proposed that yoga may improve vagal function and boost GABA — a calming neurotransmitter — through direct vagus nerve stimulation.

How to try it: Restorative or yin yoga styles — with longer holds, supported poses, and emphasis on deep breathing — may be especially effective. Even 15–20 minutes can make a difference. For another body-awareness practice, check out our guide to body scan meditation.

Gentle yoga combines slow breathing with mindful movement — activating the vagus nerve through multiple pathways at once.

5. Moderate-Pressure Massage

Research shows that moderate-pressure massage specifically activates a parasympathetic response — increasing vagally mediated HRV — while light-touch massage does not. A randomized controlled trial found that neck and head massage significantly increased vagal activity compared to rest alone.

How to try it: Gently but firmly massage the sides of your neck in slow, downward strokes for 1–2 minutes. You can also try massaging your outer ears, particularly the inner ridge (called the cymba conchae), where the auricular branch of the vagus nerve is located. Pair this with progressive muscle relaxation for a deeper calming effect.

6. The Valsalva Maneuver

This technique — bearing down as if exhaling forcefully against a closed airway — stimulates the vagus nerve through a blood pressure reflex. It's primarily used clinically for rapid heart rate, but it illustrates how powerful vagal activation can be.

How to try it: Take a deep breath, close your mouth, pinch your nose, and gently bear down for 10–15 seconds as if you were straining. Release and breathe normally. Use this one cautiously — it's not suitable for everyone (see safety section below).

7. Social Connection and Laughter

This one might surprise you, but the vagus nerve plays a central role in social engagement — controlling facial expression, vocalization, and the ability to feel safe around others. Research shows that positive social connections and vagal tone reinforce each other: feeling connected boosts vagal tone, and higher vagal tone makes it easier to connect.

How to try it: Spend time with someone who feels safe and comforting. Laugh — whether from a funny video, a conversation, or a comedy show. Even a brief, genuine social interaction can shift your nervous system toward calm.

How Vagus Nerve Exercises Work Alongside Therapy

Vagus nerve exercises are what clinicians call "bottom-up" techniques — they target the body's nervous system directly, rather than working through thoughts and beliefs. This makes them a powerful complement to "top-down" approaches like CBT, which focus on changing thought patterns.

Here's why that matters: when anxiety is intense, the thinking part of your brain can go offline, making it hard to reason your way out of a spiral. Vagal exercises help calm the nervous system first — bringing you back into what therapists call your window of tolerance — so that cognitive strategies can actually work. That's why many therapists now combine body-based techniques with approaches like ACT or CBT for better results.

Safety Tips to Keep in Mind

Most vagus nerve exercises are safe for healthy people, but a few important cautions apply:

Cold exposure: Start gradually. The American Heart Association warns that sudden cold exposure can trigger dangerous heart rhythm changes. Avoid cold immersion if you have heart conditions, uncontrolled high blood pressure, or Raynaud's disease.

Valsalva maneuver: This technique is contraindicated for people with heart conditions, glaucoma, or during pregnancy. Don't strain forcefully — gentle pressure is sufficient.

Neck massage: Avoid deep pressure directly on the carotid artery area. Carotid sinus massage is a medical procedure that should only be done by healthcare professionals — general gentle neck massage is fine.

General: If you feel dizzy, lightheaded, or faint during any exercise, stop immediately. People with bradycardia, those on heart medications, or anyone with a history of fainting should check with their doctor first.

These exercises are complementary tools — they work best alongside, not as a replacement for, professional mental health support when needed.

Putting It All Together

The vagus nerve is one of the most actionable targets in modern anxiety science. The core takeaway is simple: anxiety shows up as reduced vagal tone, and specific exercises can measurably increase it.

You don't need to do all seven exercises. Start with slow, extended-exhale breathing — it has the strongest evidence base and the lowest barrier to entry. Add one or two other techniques that appeal to you, like humming during your morning routine or splashing cold water on your face when stress spikes.

Your breath, your voice, and even a splash of cold water are real, evidence-based tools for engaging your body's built-in calm response. They're always available, completely free, and they can start working in minutes.

-Tim, Founder of Wellness AI

About the Author

Dr. Timothy Rubin holds a PhD in Psychology with expertise in cognitive science and AI applications in mental health. His research has been published in peer-reviewed psychology and artificial intelligence journals. Dr. Rubin founded Wellness AI to make evidence-based mental health support more accessible through technology.

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FAQ: Vagus Nerve Exercises for Anxiety

What is the vagus nerve and what does it do?

The vagus nerve is the longest cranial nerve in your body, running from your brainstem to your abdomen. It controls your "rest and digest" system — slowing heart rate, calming breathing, aiding digestion, and reducing inflammation.

How do you stimulate the vagus nerve naturally?

The most effective natural methods include slow deep breathing with extended exhales, splashing cold water on your face, humming or singing, gentle yoga, and moderate-pressure neck massage. Slow breathing at about 6 breaths per minute has the strongest research support.

How quickly do vagus nerve exercises work for anxiety?

Some techniques work almost immediately. Cold water on the face can slow your heart rate within 30 seconds, and slow breathing can shift your nervous system within 2–3 minutes. For lasting changes in vagal tone, consistent daily practice over several weeks shows the best results.

What is vagal tone and how do I know if mine is low?

Vagal tone reflects how well your vagus nerve regulates your stress response, measured through heart rate variability (HRV). Signs of low vagal tone include difficulty calming down after stress, digestive issues, and trouble relaxing. Many fitness trackers now measure HRV.

Is polyvagal theory scientifically proven?

Polyvagal theory is widely used in therapy as a framework for understanding nervous system states (calm, fight-or-flight, and shutdown). However, some of its specific neuroanatomical claims have been challenged by researchers. The practical exercises it popularized — like breathwork and vocalization — are supported by independent evidence regardless.

Can vagus nerve exercises replace therapy or medication?

No. These exercises are complementary tools that work best alongside professional treatment. They can help manage everyday stress and mild anxiety, but persistent anxiety or depression warrants working with a mental health professional.

What's the best vagus nerve exercise for beginners?

Start with slow, deep breathing — breathe in for 4 counts and out for 6–8 counts, aiming for about 6 breaths per minute. It's the simplest, safest, and most well-researched option, and you can do it anywhere.

Are there any risks to vagus nerve stimulation?

For most healthy people, these exercises are very safe. The Valsalva maneuver is not appropriate for people with heart conditions, glaucoma, or during pregnancy. Cold exposure should be started gradually. Stop any exercise immediately if you feel dizzy or lightheaded.