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Feeling exhausted all the time might be more than just a sign that you need a vacation. A new study suggests that chronic daytime sleepiness could be an early warning sign of cognitive decline—even dementia.
The Link Between Sleepiness and Dementia
In a recent study published in BMC Medicine, researchers followed more than 6,200 older adults for nearly seven years. They found that those who reported feeling excessively sleepy during the day had a 21 percent higher risk of developing dementia compared to those who stayed more alert.
That connection held even after accounting for other health conditions, lifestyle factors, and sleep disorders. The authors suggest that this kind of sleepiness could reflect changes in brain structure and function that occur early in the development of dementia.
Why Sleep Matters More Than You Think
Sleep is critical for brain maintenance. During deep sleep, the brain clears out toxins and consolidates memories. When sleep is disrupted—either at night or by excessive daytime drowsiness—it can interfere with these processes.
Men in particular should pay attention. Conditions like undiagnosed sleep apnea, low testosterone, and stress-related insomnia are common, and all of them can impair sleep quality in ways that chip away at long-term cognitive health.
Other Possible Causes of Excessive Sleepiness
Not every guy who hits a mid-afternoon wall is facing dementia. Daytime drowsiness can also point to other health issues:
Obstructive sleep apneaVitamin B12 deficiencyDepression or anxietyMedication side effectsPoor sleep hygiene or inconsistent sleep schedules
If fatigue is consistent and paired with forgetfulness, slower thinking, or mood shifts, it’s worth getting checked out.
What to Do If You’re Always Tired
Here’s how to stay ahead of the problem, according to the CDC:
Track your sleep habits for a few weeks.Talk to your doctor about getting screened for sleep apnea or other sleep disorders.Prioritize 7–9 hours of consistent, quality sleep.Avoid alcohol or heavy meals before bed.Cut back on blue light exposure at night.
Feeling tired is common—but chronic daytime sleepiness might be a red flag your brain can’t afford to ignore.
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