Is the parasympathetic nervous system or the sympathetic nervous system more active at night?
May 12, 2023
Source: Cainiu Health
Dr. Yang Jun
Introduction
Under normal circumstances, the parasympathetic nervous system becomes active at night. When the sympathetic nervous system is activated, the body exhibits increased heart rate, rapid breathing, and elevated blood pressure. In contrast, when the parasympathetic nervous system is activated, the body shows decreased heart rate, slower breathing, and lower blood pressure. Therefore, during nighttime, it is typically the parasympathetic nervous system that functions to allow the body to rest fully.
Under normal circumstances, the parasympathetic nervous system becomes active at night. The details are as follows:
Both the sympathetic and parasympathetic nerves are important components of the human autonomic nervous system. The sympathetic nerves primarily originate from the spinal sympathetic ganglia, while the parasympathetic nerves mainly originate from the brainstem. These two systems regulate various functions of internal organs, blood vessels, and glands to maintain normal bodily functions. Generally, when the sympathetic nervous system is activated, the body exhibits symptoms such as increased heart rate, rapid breathing, and elevated blood pressure. In contrast, when the parasympathetic nervous system is activated, the body shows decreased heart rate, slowed breathing, and lowered blood pressure. Therefore, during nighttime, it is typically the parasympathetic nervous system that predominates, acting on organs such as the heart and bronchi to promote adequate rest and recovery.
It is recommended to avoid intense physical activity and overeating before bedtime, as these may lead to sleep disturbances. Additionally, maintaining a quiet and dark sleeping environment can help improve sleep quality.
