Early rising and exercise may cut motor neurone disease risk by up to 26%

Motor neurone disease kills most people within five years of diagnosis. It is rare—affecting roughly one in fifty thousand—but merciless once it takes hold. The condition, also known as amyotrophic lateral sclerosis or ALS, destroys nerve cells in the brain and spinal cord, leaving patients unable to move, speak clearly, or swallow. There is no cure. Now a team of Chinese researchers has found that something as ordinary as waking early and staying physically active may reduce the risk of developing it in the first place.

The study followed more than five hundred thousand people with an average age of fifty-seven over fourteen years. During that period, six hundred seventy-five of them developed ALS. All participants answered detailed questionnaires about their sleep habits and exercise routines, allowing researchers to determine each person's chronotype—the natural rhythm that makes someone either a morning person or a night owl. About sixty percent of the group were classified as early risers; the remaining forty percent preferred later bedtimes and peak activity in the evening.

When researchers adjusted their analysis for age, sex, and body mass index, the pattern became clear. People who naturally woke and slept early showed a twenty percent lower risk of developing ALS compared to those who were most alert later in the day. The protective effect of physical activity was even stronger: those with greater activity levels had a twenty-six percent reduced risk. The researchers also examined sleep duration and found that people sleeping between six and eight hours nightly had lower ALS risk than those sleeping significantly more or less.

Dr. Hongfu Li of Zhejiang University in Hangzhou, who led the research, acknowledged that previous studies on sleep, activity, and ALS have produced mixed results. "Our study found a sleep schedule that better matches daylight hours and more physical activity were related to a lower risk of ALS," he said. The findings suggest that lifestyle interventions—encouraging people to align their sleep with natural light cycles and to exercise regularly—might represent a practical strategy for reducing disease risk, though Li cautioned that more research is needed to confirm the relationship.

The broader context matters here. Night owls have long been found to carry higher health risks overall: they die earlier on average and face elevated chances of cancer, diabetes, psychological disorders, and neurological problems. Researchers believe this stems partly from chronic stress—night owls often struggle to fit their natural rhythms into the nine-to-five structure of modern life, creating constant friction between their biology and their obligations. If that stress contributes to neurodegenerative disease, then helping people align their schedules with their chronotype might offer unexpected health dividends.

The research was presented at the American Academy of Neurology's annual meeting in Chicago. It represents one more piece of evidence that the way we live—when we sleep, how much we move—shapes our vulnerability to diseases we cannot yet treat. For a condition as devastating as ALS, even a twenty or twenty-six percent reduction in risk is significant. The question now is whether these associations hold up under further scrutiny, and whether they point toward genuine prevention or merely correlation.