How does sunlight and circadian rhythm affect heart health?
Sunlight and your body's internal clock (circadian rhythm) are closely connected to heart health. Your body naturally produces melatonin — a sleep hormone — when it gets dark, helping regulate your sleep-wake cycle. Disruptions to this rhythm can affect sleep Show Full Answer
How does sunlight and circadian rhythm affect heart health?
Sunlight and your body's internal clock (circadian rhythm) are closely connected to heart health. Your body naturally produces melatonin — a sleep hormone — when it gets dark, helping regulate your sleep-wake cycle. Disruptions to this rhythm can affect sleep quality, which is common in people with heart conditions.
Here's how sunlight and circadian rhythm tie into heart health:
- Sunlight exposure during the day helps keep your circadian rhythm on track, supporting better sleep at night
- Poor sleep can add stress to the body and make managing heart disease more challenging
- Melatonin supplements, sometimes used when the natural rhythm is disrupted, have recently been linked in a large study to a higher risk of heart failure with long-term use — so it's worth discussing with your doctor before using them regularly
- Cold, low-sunshine days have also been associated with increased heart attack risk, possibly due to blood vessel constriction and behavioral changes
A consistent daily routine — including regular sleep times and daily physical activity — can help support your circadian rhythm naturally and benefit your heart health.
If sleep remains a challenge, speaking with your healthcare provider is a great first step to finding a heart-safe solution.
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