Experiencing persistent, excessive sleepiness, whether it’s the well-known 3 PM slump or a more constant feeling of being wiped out, is a common human experience. While occasional tiredness is normal, especially during busy periods or when sleep hygiene is neglected, consistent fatigue can indicate underlying health issues. Recent scientific research, specifically focusing on older adults, suggests that this type of excessive sleepiness could serve as a significant warning sign for dementia. It is crucial to distinguish between normal age-related tiredness, such as a preference for afternoon naps which is often earned and beneficial, and a concerning increase in sleepiness over time.

A notable study, published in the journal Neurology, meticulously tracked the sleep patterns, including napping habits, of 733 women in their 80s using sleep trackers. Over an approximate five-year follow-up period, the researchers observed that 164 of these women developed mild cognitive impairment, characterized by noticeable changes in memory and thinking skills, and 93 were subsequently diagnosed with dementia.

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The study's key finding revealed that individuals who experienced substantial increases in sleepiness over time, including a rise in excessive napping, had double the risk of developing dementia. Consequently, the researchers concluded that changes in sleep patterns could potentially serve as an “early marker” or risk factor for dementia in older women.

The exact mechanisms linking excessive sleepiness to dementia are not yet fully understood. As Clifford Segil,DO, a neurologist at Providence Saint John’s Health Center, explains, “If you ask two different neurologists, you may get two different answers as we still don’t know the reason we sleep.” However, Dr. Segil highlights the established connection between sleep and memory consolidation, the process by which short-term memories transition into long-term ones, as well as its overall importance for good health.

He emphasizes that for octogenarians—individuals in their 80s—a good night’s sleep is more vital than a daytime nap. Dr. Segil further notes that poor sleep in younger individuals is associated with difficulties in consolidating memories, a problem likely exacerbated with age, suggesting that “memory retrieval is likely affected by poor sleep in elderly patients.” Therefore, consistent poor sleep could significantly impair memory, particularly as one ages.

Beyond its potential link to dementia, persistent daytime sleepiness can also be a symptom of various other health conditions. According to Dr. Segil, it is most frequently associated with obstructive sleep apnea, a condition whose primary symptoms include daytime sleepiness or non-restorative sleep. Other potential causes of feeling tired during the day include narcolepsy, anemia, depression, and certain vitamin deficiencies. Given the broad range of possible causes, it is essential to consult a healthcare provider if experiencing consistent tiredness.

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For those concerned about dementia, it is helpful to be aware of other common signs and symptoms, as identified by the National Institute on Aging (NIA). These include memory loss, poor judgment, confusion, difficulty speaking, understanding, and expressing thoughts, wandering and getting lost in familiar areas, challenges with managing money and paying bills, repeatedly asking questions, using unusual words for familiar objects, taking longer to complete daily tasks, losing interest in routine activities, experiencing hallucinations, delusions, or paranoia, acting impulsively, demonstrating a lack of concern for others' feelings, and developing problems with balance and movement. If you or a loved one are consistently grappling with daytime sleepiness, seeking a proper medical evaluation is highly recommended to determine the underlying cause and ensure appropriate care.