Waking Up at 3 AM Every Night? Sleepless Nights, a Warning Sign from Your Body

When the Donguibogam's concept of defensive qi is examined from the perspective of modern medicine, it is closely connected with our autonomic nervous system and sleep hormone regulatory mechanisms. The defensive qi that moves actively during the day to protect our body can be compared to the activation of the sympathetic nervous system and the secretion of cortisol. The sympathetic nerve is responsible for the fight-or-flight response, arousing our body and mobilizing energy during stressful situations or physical activities. Cortisol is also secreted at its highest level in the morning, helping us wake up and function. However, the requirement that this defensive qi enter yin at night can be interpreted to mean that sympathetic nervous system activity should decline, the parasympathetic nervous system should become dominant, cortisol levels should fall, and melatonin secretion should be stimulated. The parasympathetic nerve governs the rest-and-digest response, stabilizing the body by lowering heart rate, relaxing muscles, and aiding digestion. Melatonin is the key sleep hormone that induces rest. If defensive qi fails to enter yin and lingers in yang, this signifies a state where chronic stress, irregular lifestyle habits, excessive caffeine intake, and late-night smartphone use overactivate the sympathetic nervous system at night and keep cortisol levels elevated. In particular, the symptom of waking around 3 AM can be closely related to the cycle of cortisol secretion. Our body is normally designed to gradually increase cortisol secretion starting around 2 to 3 AM so that it peaks in the morning; when stress or autonomic nervous system imbalance is severe, this cortisol secretion is triggered too early and excessively, causing one to awaken from sleep. Additionally, the suppression or irregularity of melatonin secretion is also a major issue. Exposure to bright light before bedtime or stimulating the brain through late-night activities interferes with melatonin production, making it difficult to initiate sleep and reducing sleep quality. This corresponds directly with the Donguibogam's phrase that yang qi is full and cannot enter yin, keeping the body in an aroused daytime state when it should be asleep. Ultimately, from a modern neuroendocrinology perspective, the wisdom of Donguibogam emphasizes how important maintaining homeostasis is for sleep quality. Rather than simply thinking that sleep will not come, we should understand this as a sign that appears while our body struggles to regain balance amidst stress and imbalance.