Por Renan Filho · 2026-10-29**Lead**
Daylight saving time (DST) officially ends at 2:00 a.m. on Sunday, November 1, 2026, when clocks across most of the United States will be set back one hour. While gaining an extra hour of sleep sounds like a welcome change, sleep medicine experts warn that the transition can still disrupt the body’s internal clock, leading to increased risks of cardiovascular events, mood disturbances, and impaired cognitive function. Dr. Charles Czeisler, director of the Division of Sleep Medicine at Harvard Medical School, has outlined six practical steps Americans can take to protect their sleep and overall health during the shift.
**Contexto**
The biannual clock change has long been a subject of debate among health professionals. The American Academy of Sleep Medicine has repeatedly called for the elimination of daylight saving time, citing research that links the spring transition to a spike in heart attacks and strokes. The fall transition, while generally considered less harmful, still forces the body to adapt to a new light-dark cycle. According to data from the National Institutes of Health, the human circadian rhythm is highly sensitive to even one-hour shifts in light exposure, and the adjustment period can last several days to a week.
Dr. Czeisler, a leading authority on circadian biology, emphasizes that the fall change can paradoxically lead to sleep deprivation for some individuals. “Many people stay up later on Saturday night, thinking they will simply sleep in on Sunday morning,” he explained in a recent interview with the Harvard Gazette. “But the body’s internal clock does not reset instantly. The result is often fragmented sleep and daytime fatigue.”
The six strategies recommended by Dr. Czeisler are grounded in decades of clinical research and are designed to help the body adapt smoothly to the new schedule. They include: (1) gradually shifting bedtime by 15 to 20 minutes earlier each night starting three days before the change; (2) exposing yourself to bright natural light in the morning immediately after waking on Sunday; (3) avoiding caffeine and alcohol for at least six hours before the new bedtime; (4) keeping the bedroom completely dark and cool; (5) maintaining a consistent wake-up time even on the weekend; and (6) using a short nap of no more than 20 minutes in the early afternoon if needed.
**Analise**
The importance of these measures extends beyond mere comfort. Research published in the journal *Sleep* has shown that even a one-hour shift in the sleep-wake cycle can increase the risk of workplace accidents and traffic collisions in the days following the transition. The National Highway Traffic Safety Administration has documented a measurable uptick in drowsy-driving incidents during the week after both DST changes. For individuals with pre-existing conditions such as hypertension, diabetes, or depression, the disruption can exacerbate symptoms.
Dr. Czeisler’s recommendations also highlight a broader public health concern: chronic sleep deprivation in the United States. The Centers for Disease Control and Prevention has declared insufficient sleep a public health epidemic, with more than one in three adults reporting that they get less than the recommended seven hours per night. The DST transition, while temporary, can push already vulnerable individuals further into sleep debt. By adopting the six strategies, Americans can not only mitigate the immediate effects of the clock change but also reinforce long-term sleep hygiene habits.
**Fontes**
- Harvard Gazette, interview with Dr. Charles Czeisler, October 2026. - American Academy of Sleep Medicine, position statement on daylight saving time. - National Institutes of Health, National Heart, Lung, and Blood Institute, circadian rhythm research. - Centers for Disease Control and Prevention, sleep and sleep disorders data. - National Highway Traffic Safety Administration, drowsy driving statistics.