Why your grandparents wake up early might be in their blood
In short: It is a common trope that older adults are naturally early risers. While genetics play a role, new research suggests that the secret might lie in the blood. A circulating factor in older bodies could be physically shifting the internal clocks of cells, forcing a shift in human behavior.
The shift toward earlier sleep and wake cycles is a well-documented part of the natural aging process. While many assume it is simply a matter of needing less sleep, researchers suggest the change is driven by interconnected internal and external factors. One primary mechanism involves the body's circadian clock, which is governed by the expression of specific genes in our cells. These genes determine the peaks of activity throughout a 24-hour period, dictating when we feel alert or tired.
A significant study published on April 11 in the Proceedings of the National Academies of Sciences explored this by testing skin cells from individuals in their 20s and 60s. University of Zurich's Institute for Pharmacology and Toxicology experts observed that skin cells from youth altered their patterns when cultured within 60-year-olds' blood serum. The cells began to behave as if they were older, with gene expression peaks occurring up to two hours earlier than normal. Such results imply that a circulating molecule or hormone within elderly blood can alter the internal rhythms of separate cells.
While this blood-based mechanism is a compelling discovery, it is not the only factor. Experts note that environmental changes also contribute; older people may spend less time outdoors or have less exposure to sunlight, both of which can impact the body's internal timing. Additionally, some researchers have pointed to the presence of 'brain sand' as a bizarre contributing factor to the sleep patterns of the elderly. Ultimately, the shift is a complex interplay of genetics, blood chemistry, and lifestyle changes that collectively move the human schedule forward.
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Sources
- Summary by Intellect · source: The Wild Reasons Many Older People Wake Up So Early
- Also: Why You Wake Up Earlier As You Get Older | U-M LSA Department of Psychology
- Also: Discovery Reveals Why Old People Go to Bed Early | Live Science
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