Timing is everything.

As daylight saving time approaches, the American Heart Association reminds us that regular interruptions to our body’s internal clock don’t just cause inconvenient sleep disturbances but may also trigger adverse effects, especially with our hearts.

“We need to develop methods to determine a person’s internal clock timing and synchronization so that we can personalize recommendations for the timing of sleep, meals, exercise, medications and therapy,” Kristen Knutson, Ph.D., volunteer chair of the American Heart Association Scientific Statement writing group , tells TODAY.com.

The statement , about the role circadian rhythm plays in heart health, published on Oct. 28, 2025, represents the consensus of leading experts in heart disease and stroke.

“To my knowledge

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