Every spring, millions of us “spring forward” — losing an hour of sleep when Daylight Saving Time begins. It feels like a small shift, just 60 minutes. But research consistently shows that this single hour disruption has outsized effects on our health, safety, and performance.
As The Sleep Ambassador®, I’ve been helping people navigate this transition for years. The good news is that with the right approach, you can minimize the impact and adapt quickly. Here’s how.
Why One Hour Matters More Than You Think
The transition to Daylight Saving Time doesn’t just cost you an hour of sleep. It shifts your entire circadian rhythm — your body’s internal clock that regulates sleep-wake cycles, hormone production, body temperature, and dozens of other biological processes.
The effects are measurable:
- Heart attacks spike by approximately 24% on the Monday after the spring time change
- Stroke risk increases by about 8% in the two days following the transition
- Traffic accidents rise by roughly 6% in the week after the change
- Workplace injuries increase in both frequency and severity
- Judgment and decision-making suffer — the stock market even shows patterns of poorer performance
These aren’t minor inconveniences. They’re real health and safety consequences that result from disrupting our biological rhythms.
Prepare in Advance: The Gradual Shift Method
The single most effective strategy for adapting to Daylight Saving Time is to shift your schedule gradually in the days before the change. Starting about a week before:
- Go to bed 15 minutes earlier each night leading up to the time change. By the time Sunday arrives, you’ll have shifted your sleep window by a full hour.
- Wake up 15 minutes earlier as well, maintaining consistent sleep and wake times.
- Expose yourself to morning light as early as possible. Sunlight is the most powerful signal to your circadian clock, telling your body it’s time to be alert.
The Weekend of the Time Change
When the time change arrives, these practices will help you adapt:
Saturday Night
- Go to bed at your already-adjusted earlier time
- Avoid alcohol — it may help you fall asleep but fragments sleep architecture
- Avoid screens for 30-60 minutes before bed, or use blue-light filtering
- Keep your bedroom cool, dark, and quiet
Sunday Morning
- Get outside into natural sunlight as early as possible
- Don’t nap — stay awake until your adjusted bedtime
- Get physical activity during the day, but not within 3 hours of bedtime
Monday and Beyond
- Stick to your adjusted schedule — consistent sleep and wake times are key
- Avoid relying on extra caffeine to compensate; it masks fatigue without addressing the underlying circadian disruption
- Be extra cautious driving, especially in the morning when it may be darker than usual
A Word About the Fall-Back Transition
When we “fall back” and gain an hour, many people assume it’s easier. In practice, this transition creates its own challenges:
- The temptation to stay up later because you “gain” an hour undermines consistent sleep habits
- Earlier sunset can trigger mood changes and seasonal affective patterns
- Disrupted exercise routines as evening activities move into darkness
The same principles apply: maintain consistent schedules, maximize daylight exposure, and prioritize your sleep environment.
The Bigger Picture: Why Time Changes Are Problematic
There is growing scientific consensus that biannual time changes do more harm than good. Sleep researchers, including the American Academy of Sleep Medicine, have advocated for eliminating time changes entirely and adopting permanent standard time, which aligns better with human circadian biology.
Until policy catches up with science, the best approach is to treat time changes as a circadian health event — something worth preparing for and managing intentionally, just as you would any other health challenge.
Your Sleep Deserves Attention Year-Round
Daylight Saving Time is a reminder that sleep is not optional. It’s a biological necessity that affects every aspect of your health, performance, and well-being. Whether it’s March or November, the principles of good sleep remain the same: consistent schedules, morning light exposure, a cool dark sleep environment, and nasal breathing.
For more on adapting to time changes, read my original article on Thrive Global: Spring Forward Gently.
By Nancy H. Rothstein, MBA, The Sleep Ambassador®