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Why does slow-wave sleep decrease as people age?
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Slow-wave sleep (SWS), also known as stage 3 NREM sleep, is characterized by high-amplitude, low-frequency delta wave activity and is critical for physical repair and development. While slow-wave activity peaks during childhood, it progressively declines throughout the human life cycle.12
The decrease in slow-wave sleep as people age is linked to several factors:
- Natural Physiological Decline: There is a gradual, age-related reduction in stage 3 sleep, which may cease entirely in some elderly individuals. This is associated with an alteration of brain structures involved in sleep regulation, leading to a weakening of sleep oscillations such as slow waves.3
- Health and Lifestyle Factors: While some decline is physiological, reduced sleep quality in older adults is often exacerbated by the increased incidence of illness, the use of medications, and sleep disorders such as sleep apnea.3
These changes reflect broader developmental shifts in sleep architecture, where the brain's capacity to generate and maintain the high-amplitude oscillations characteristic of deep sleep diminishes over time.23