The idea that sleep diminishes with age is not simply a matter of willpower; it stems from precise physiological shifts within the body. When examined through modern science, the insights of Donguibogam align closely with biological mechanisms.
First, our bodies rely on a central regulatory mechanism known as the biological clock. Located in the suprachiasmatic nucleus of the brain, it regulates the secretion of the sleep hormone melatonin in response to light and dark cycles, governing our circadian rhythm. With age, the function of the suprachiasmatic nucleus gradually declines, leading to a marked decrease in melatonin secretion. Much like a clock losing its tension, melatonin is not released in sufficient amounts at night, meaning the brain fails to receive a clear signal that it is time to sleep. Consequently, achieving the deep sleep of younger years becomes harder, and early awakenings become more frequent.
Sleep architecture also shifts over time. Sleep consists of several stages, and the proportions of deep slow-wave sleep and dream-related REM sleep decrease significantly in older adults. Instead, light sleep becomes more predominant, sleep talking may increase, and slight sounds or minor physical discomfort easily awaken the person. Just as a building's structure may weaken over time and let drafts through the window frames, sleep architecture becomes lighter and more vulnerable to external disturbances.
Various age-related physical changes also directly disrupt restful sleep. Common factors include nocturia, where benign prostatic hyperplasia or overactive bladder causes repeated nighttime bathroom visits; chronic pain such as joint pain or muscle pain; and sleep disorders like sleep apnea or restless legs syndrome. In addition, medications such as those for hypertension or depression can alter sleep quality, while daily stress and low mood also play an influential role.
From the standpoint of modern medicine, an imbalance in the flow of spirit qi and yin and yang reflects a dysregulated autonomic nervous system caused by biological clock shifts, reduced melatonin, altered sleep architecture, and underlying health conditions. Poor sleep causes more than simple fatigue; it can contribute to memory impairment, impaired concentration, weakened immunity, and an increased fall risk. Practicing gentle acupressure before bed can be an effective, consistent way to support deeper and more stable sleep.
