Market scope note: This article draws on sources from both Korea and the United States. Each piece of information is marked 🇰🇷 Korea or 🇺🇸 U.S. in the text to indicate which country it applies to.
You have probably seen it happen — lunch ends, and before long your parent is sound asleep on the sofa. It is easy to brush off with a quiet thought: 'They're getting on in years; of course they're tired.' But excessive sleepiness during the day may be more than a simple sign of aging. This article calmly examines what health concerns excessive daytime sleepiness in older adults can be connected to, and how family caregivers can watch for it and respond.
🇰🇷 Korea According to data from 분당서울대학교병원 (Seoul National University Bundang Hospital), approximately 50% of the elderly population in Korea suffers from sleep problems. The most common sleep disorders in older age are insomnia and circadian rhythm sleep disorders. When a pattern of difficulty falling asleep, frequent nighttime waking, or very early morning waking repeats itself, it leads to daytime fatigue, drowsiness, and loss of motivation. As people age, the neurological function that governs the body clock declines, causing the circadian rhythm to shift earlier; reduced melatonin secretion further degrades sleep quality over time.
🇺🇸 U.S. According to data from the NCOA (National Council on Aging), between 20% and 60% of older adults report napping during the day to make up for insufficient nighttime sleep. The concern lies in the length and pattern of those naps. A study that followed adults across 21 countries found that middle-aged and older adults who napped for more than 30 minutes a day actually faced an increased risk of cardiovascular and cerebrovascular disease, and this trend was even more pronounced in adults aged 65 and older. A research team at Mass General Brigham in Boston also observed 1,300 adults aged 56 and older over 19 years and found a statistically meaningful association between longer and more frequent napping and higher mortality rates.
The relationship between excessive daytime sleepiness and cognitive function deserves particular attention. 🇺🇸 U.S. A meta-analysis published in 2024 in the international academic journal PubMed, involving 65,501 participants, found that excessive daytime sleepiness was statistically significantly associated with approximately a 1.26-fold higher risk of cognitive decline and approximately a 1.68-fold higher risk of all-cause dementia. 🇺🇸 U.S. Another study reported that in women aged 80 and older, greater daytime sleepiness was associated with an increased risk of developing dementia. Because daytime sleepiness may be either a consequence of dementia or an early signal of it, careful observation by caregivers is essential.
So what should be considered a warning sign? Pay close attention if your parent's napping time has increased sharply and suddenly, if naps lasting more than 30 minutes have become frequent, or if they feel they absolutely must nap just to get through the day. Sleep apnea, chronic obstructive pulmonary disease (COPD), recurring nighttime pain, or the side effects of medications can all cause excessive daytime sleepiness. When multiple medications are taken together, ingredients that affect sleep can compound each other, so it is a good idea to review the full medication list with the treating physician.
There are also practical steps that can help in daily life. 🇰🇷 Korea According to a neurology specialist at 가톨릭대 인천성모병원 (Incheon St. Mary's Hospital, The Catholic University of Korea), getting sunlight during the day helps the body clock function normally and improves nighttime sleep quality. Maintaining regular mealtimes and a consistent wake-up time, and reducing irregular napping, also support the recovery of a healthy sleep rhythm. Taking sleep medication on one's own because sleep is difficult can actually interfere with deep sleep, so caution is needed. 🇺🇸 U.S. Beginning in January 2025, Medicare began covering FDA-approved digital Cognitive Behavioral Therapy for Insomnia (CBT-I) programs accessible via smartphone or tablet. These programs are available through a physician's prescription and Medicare Part B, so families living in the United States are encouraged to ask their doctor about this option.
The role of a family caregiver is one of observation, not surveillance. The first step is to quietly take note — within ordinary conversation — of whether your parent is dozing frequently during the day, whether this has increased noticeably in recent times, and whether they are sleeping properly at night. If you notice a change, please share the specifics with the clinic your parent visits, with 치매안심센터 (Dementia Care Center) in Korea, or with the primary care clinic in the United States. Concrete information — such as 'daytime napping has grown to more than one hour a day' — is far more useful to medical professionals than a vague remark like 'they seem a bit tired lately.'
Sources: 분당서울대학교병원 건강정보 (노년기 수면건강), NCOA (National Council on Aging) Sleep Statistics for Older Adults 2026, JAMA Network Open (낮잠과 사망률 연관 연구, 매스 제너럴 브링햄·러시 대학병원), PubMed/PMC — Effect of Excessive Daytime Sleepiness on All Cause Dementia (메타분석, 2024), Alzheimer's Research Association — Daytime Sleepiness May Double Dementia Risk in Older Women (2025), 미주 한국일보 (낮잠 건강 영향 연구 보도, 2026.02), Solace Health — Medicare Sleep Solutions 2025, 대한수면연구학회 2024년 조사 (농민신문 보도 인용).
Note: This article was compiled by AI from the sources cited above. We strive for accuracy, but for decisions about your specific situation, please confirm the latest guidance from a professional or the relevant agency.