Yes! Even just 3 nights of poor sleep can have measurable negative effects on heart health, according to research. Here’s what the science says:

Key Findings on Poor Sleep and Heart Health

1. Increased Blood Pressure:
   • A 2023 study in Psychosomatic Medicine found that 3 nights of insufficient sleep (≤4 hours) led to higher blood pressure—especially at night—compared to normal sleep.
   • Even young, healthy adults showed these changes, suggesting short-term sleep loss strains the heart.
2. Higher Inflammation & Stress Hormones:
   • Poor sleep triggers increased cortisol (stress hormone) and C-reactive protein (inflammation marker), both linked to heart disease risk.
3. Impaired Blood Vessel Function:
   • Just one night of bad sleep can reduce endothelial function (blood vessel flexibility), raising the risk of atherosclerosis over time (European Heart Journal, 2019).
4. Higher Risk of Arrhythmias:
   • Chronic poor sleep is tied to atrial fibrillation (AFib), but even short-term sleep deprivation may disrupt heart rhythm stability.

Why It Matters for Heart Attack Survivors

• Sleep is critical for heart repair (e.g., lowering stress on arteries, regulating metabolism).
• Poor sleep worsens other risks (e.g., hypertension, diabetes, obesity).

Quick Fixes for Better Sleep

Keep a consistent sleep schedule (even on weekends).
Avoid screens 1 hour before bed (blue light disrupts melatonin).
Limit caffeine/alcohol (both fragment sleep).
Dark, cool room (60–67°F) improves deep sleep.
Relaxation techniques (deep breathing, meditation).

Reference:

https://theconversation.com/just-three-nights-of-poor-sleep-might-harm-your-heart-new-study-256534

https://health.medicaldialogues.in/health-topics/heart-health/just-3-nights-of-poor-sleep-may-harm-your-heart-study-148950

https://www.medicalnewstoday.com/articles/just-3-nights-poor-sleep-may-harm-heart-health

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