Sleep & the Nervous System: How the Vagus Nerve Can Influence Your Sleep
Sleep begins in the nervous system. How the vagus nerve supports recovery.
10 March 2026
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Jasmin Cohen | Barbara Veigl-Trouvain
Many people experience the same situation: they feel tired, yet internally they are not calm or relaxed. Their thoughts keep racing, and the body doesn’t fully shift into recovery.
What might be behind this?
Good sleep is not only a matter of fatigue or healthy habits - it is also closely connected to the state of our nervous system.
More specifically: to the balance between activation and regulation.
Our autonomic nervous system unconsciously regulates essential bodily functions such as heartbeat, breathing, and stress responses.
It consists of two main components:
Sympathetic nervous system – activates, mobilizes, and keeps us alert
Parasympathetic nervous system – calms the body, supports recovery, and enables rest
The vagus nerve is the most important nerve of the parasympathetic system¹. It helps the body transition from activity into recovery. If this transition does not happen in the evening, the body can remain subconsciously in activation mode - even when we want to sleep.
The connection between the vagus nerve and sleep quality has received increasing attention in recent years. Studies suggest that gentle vagus nerve stimulation may improve sleep quality in people with chronic sleep problems⁴.
Another comprehensive study concludes that this form of stimulation could potentially have positive effects on insomnia, although researchers emphasize that further studies are needed⁵.
For everyday life, this means:
Scientific evidence confirms that the nervous system and sleep are closely linked. However, what matters most is daily regulation of the nervous system.
Stress activates the sympathetic nervous system. If this activation persists, the body has difficulty shifting into the parasympathetic recovery state.
In the Mavie Stress Study 2025, 70% of respondents reported feeling stressed frequently or very frequently⁶. Nearly half also reported experiencing stress-related sleep problems⁶.
This shows that sleep problems are often part of a broader regulatory imbalance and should not be viewed in isolation, but rather in the context of stress, tension, and insufficient recovery.
Healthy sleep hygiene works best when it is not approached as an optimization project, but as support for the nervous system.
A consistent wake-up time supports the sleep–wake cycle and can improve sleep quality over time² ³.
Bright light and intense stimuli keep the nervous system activated. Dim lighting and calm evening routines can help the body transition into rest² ³.
Slow breathing with a longer exhalation can stimulate parasympathetic activity¹.
Even a few minutes in the evening may help reduce internal activation.
If stress is constant, sleep hygiene alone is often not enough. In such cases, it is important to look more closely at the underlying causes.
Sleep disturbances rarely occur without context. They are often connected to stress, hormonal factors, lifestyle, and individual strain.
A holistic perspective means:
taking symptoms seriously
understanding underlying connections
creating clarity step by step
Sometimes small lifestyle adjustments are enough. In other cases, structured medical diagnostics may be necessary.
A first step may be to better understand your individual stress levels.
Imbalanced blood values can significantly affect energy levels or even keep you awake at night.
A comprehensive health test, such as the MavieMe Energy Booster & Sleep Support Test, can provide insights from the comfort of your home into why you may feel exhausted during the day.⁸
For persistent or severe symptoms, medical evaluation in a sleep laboratory may be advisable. There, sleep disorders such as insomnia or sleep apnea can be examined in detail⁹ ¹⁰.
The sleep laboratories at Privatklinik Döbling and Privatklinik Graz Ragnitz offer medical diagnostics with professional supervision.
Sleep is not a performance project. It is a biological process that occurs when the nervous system allows safety and recovery.
The vagus nerve plays an important role in this process - not as a standalone solution, but as part of a complex system.
When we understand and support our nervous system, we create better conditions for restorative sleep.
Sources:
1. Cleveland Clinic (2022). Vagus Nerve: What It Is, Function, Location & Conditions. https://my.clevelandclinic.org/health/body/22279-vagus-nerve
2. Centers for Disease Control and Prevention (CDC) (2024). About Sleep https://www.cdc.gov/sleep/about/index.html
3. National Heart, Lung, and Blood Institute (NHLBI), NIH (2022). Healthy Sleep Habits. https://www.nhlbi.nih.gov/health/sleep-deprivation/healthy-sleep-habits
4. Zhang, S. et al. (2024). Transcutaneous Auricular Vagus Nerve Stimulation for Chronic Insomnia Disorder: A Randomized Clinical Trial. JAMA Network Open. https://jamanetwork.com/journals/jamanetworkopen/fullarticle/2828072
5. Zhang, Y. et al. (2025). Transcutaneous Auricular Vagus Nerve Stimulation in Insomnia: A Systematic Review and Meta-Analysis. https://pubmed.ncbi.nlm.nih.gov/40323248/
6. ORF.at (16.02.2026). Viele Europäer leiden an Schlafstörungen. https://orf.at/stories/3420320/
7. Mavie (2025). Mental Health & Stress Studie 2025 https://www.mavie.care/de-AT/mental-health-und-stress-studie
8. MavieMe. Cortisoltest / Hormontest (inkl. Hinweis zu Schlafproblemen & innerer Unruhe) https://www.mavie.me/de/warum-bin-ich-so-muede
9. Privatklinik Döbling. Schlaflabor https://www.privatklinik-doebling.at/de/medizinische-leistungen/schlaf/schlaflabor
10. Privatklinik Graz Ragnitz. Schlaflabor https://www.privatklinik-graz-ragnitz.at/de/medizinische-leistungen/lunge-atemwege/schlaflabor