A doctor and healthcare educator has sparked widespread discussion after claiming that people who remain mentally sharp into their 90s often share one simple morning habit: getting natural sunlight within 30 minutes of waking up. The advice comes from Dr. Neal K. Shah, who shared the recommendation in a widely viewed YouTube video explaining how early morning light may influence sleep quality and long term brain health. However, while experts agree that morning sunlight supports healthy circadian rhythms, they caution that no single habit can guarantee protection against dementia.
Dr. Shah said neurologists studying cognitively healthy nonagenarians repeatedly identified a common morning routine centered on natural light exposure.
He explained, “Neurologists studied people who stayed cognitively sharp into their 90s and they kept finding the same thing in their morning routine. But first, you need to understand what happens to your brain at night.”
Morning sunlight and the brain’s internal clock
According to Dr. Shah, the brain carries out an important cleaning process during sleep that helps remove waste proteins associated with neurodegenerative diseases such as Alzheimer’s.
He said, “Here’s what most people don’t know: the quality of tonight’s cleaning cycle is determined by what you do tomorrow morning.”
He urged people to avoid checking their phones immediately after waking.
“Within the first 30 minutes of waking, most people grab their phone, scroll, and in doing so they accidentally sabotage the most protective thing in their ageing brain,” he said.
Instead, he recommends spending about 10 minutes outdoors in natural daylight before using screens or drinking coffee.
“Within the first 30 minutes of waking, before any screens, even before coffee, before anything. That one decision sets your cortisol levels, your melatonin and your brain’s overnight cleaning cycle.”
Scientists have found that exposure to morning light helps regulate the body’s circadian rhythm, improving sleep quality. Good sleep supports the brain’s glymphatic system, which becomes most active during deep sleep and helps remove metabolic waste. However, researchers continue to study how this process influences dementia risk over time.
Experts say dementia prevention requires multiple healthy habits
The video generated mixed reactions online. Some viewers questioned the claim by pointing out that dementia existed long before smartphones. Others noted that regular morning sunlight is difficult in countries with limited daylight during parts of the year.
One commenter wrote, “Dementia has been around much longer than cell phones.” Another added, “When you live somewhere that has very little sunlight, it is impossible to do this every day.”
Others reported positive experiences. One viewer commented, “A month back I started getting up to see the sunrise. Now it is a habit. I naturally wake just before it rises, whatever the time, as if by magic.”
Dr. Shah also highlighted “robust curiosity” as another habit linked to healthy ageing.
Health organizations, including the Alzheimer’s Association, emphasize that dementia risk depends on many factors. Regular exercise, quality sleep, a healthy diet, controlling blood pressure, social engagement and lifelong learning all contribute to better brain health. Morning sunlight can support those habits, but current scientific evidence does not show that it alone prevents dementia.
