Long daytime naps may increase the risk of dementia in older adults, according to a study by researchers at the University of California. This finding has caused concern for many, including retired Mr. Li, who has been taking long naps for over a decade.

He quickly shared the news with his friends, causing a frenzy of online searches to confirm the study's accuracy.

Another study conducted in Guangzhou in 2020 also found a link between extended napping and increased cardiovascular disease and overall mortality risk.

However, a study from Spain suggests that the optimal nap duration is 15-30 minutes. These findings highlight the importance of proper nap habits, with excessive nap duration and late napping shown to disrupt the body's natural rhythms.

Experts, including Dr. Zhong Nanshan, advise a 30-minute nap for individuals over 50. Additionally, it is recommended to avoid napping immediately after lunch, sleeping in a prone position, and taking late naps to ensure a healthy nap routine.