The nervous system is the body's control center that managing everything from movement to automatic functions like breathing. It is divided into two main components: the central nervous system (CNS), which includes the brain and spinal cord, and the peripheral nervous system (PNS), which consists of nerves that connect the CNS to the rest of the body. The PNS is further divided into the somatic nervous system which controls voluntary movements and the autonomic nervous system which regulates involuntary functions. Within the autonomic nervous system, it is divided into two systems which is sympathetic and parasympathetic.  The sympathetic nervous system activates the "fight-or-flight" response, increasing heart rate and redirecting blood flow during stress, while the parasympathetic nervous system promotes relaxation by slowing heart rate and enhancing digestion. Together, these systems ensure the body responds appropriately and maintains homeostasis. However, if the sympathetic and parasympathetic systems do not operate in balance, it causes nervous system dysregulation.

Figure 1: Nervous system dysregulation is a physiological state of imbalances between the sympathetic and parasympathetic systems.

Nervous system dysregulation happens when its normal function is disrupted, causing imbalances in how the body responds to stimuli. Various parts of the peripheral nervous system may become excessively activated due to factors like chronic stress, trauma, autism, mental health conditions and sleep disorders. The signs and symptoms of a dysregulated nervous system can be seen through physical, emotional and psychological, cognitive and behavior changes. Physically, it may cause fatigue, headaches, digestive issues and sleep disturbances due to its impact on autonomic functions like heart rate and digestion. Meanwhile, emotionally it causes anxiety, depression and heightened sensory sensitivity. Moreover, prolonged dysregulation can result in hyperarousal, difficulty concentrating and hypervigilance, where individuals become overly attuned to their surroundings, struggling to filter sensory input and reacting more intensely to stimuli. Together, these symptoms impact both physical and mental well-being.

There are several strategies in managing nervous system dysregulation. It involves a combination of mindful practices, movement, professional support and lifestyle adjustments. Mindful techniques like meditation and deep breathing help activate the parasympathetic nervous system to reduce stress and anxiety. Regular physical movement such as walking, stretching or yoga supports nervous system regulation by releasing built-up tension and promoting sensory grounding. Seeking guidance from trained therapists or medical professionals can provide tailored strategies for healing. Additionally, maintaining a consistent routine, prioritizing quality sleep, limiting caffeine intake and fostering a safe environment can promote long-term balance and well-being. Thus, recognizing nervous system dysregulation is key to restoring balance and maintaining a positive mindset, as understanding its signals allows us to support healing and resilience.

References:
Bayram-Weston Z et al (2022) Nervous system 1: introduction to the nervous system. Nursing Times; 118: 3.
Garza-Ulloa, J. (2024). Perspective Chapter: Theory for nervous system dysregulation and sleep alterations. IntechOpen. doi: 10.5772/intechopen.1006147
Zimmerman, M. E., Benasi, G., Hale, C., Yeung, L. K., Cochran, J., Brickman, A. M., & St-Onge, M. P. (2024). The effects of insufficient sleep and adequate sleep on cognitive function in healthy adults. Sleep Health. 10(2), 229–236. https://doi.org/10.1016/j.sleh.2023.11.011

Prepared by:

Dr. Nur Akmal Ishak
Biology Unit, ASPutra.

Tarikh Input: 11/06/2025 | Kemaskini: 11/06/2025 | emma