best cardiac doctors in bangalore Morning Cardiac Myocardial Infarction (MI) or heart attacks are more common and often more severe between 6 a.m. and noon due to a 'perfect storm' of physiological changes that occur as the body wakes up. Key reasons for the increased risk in the morning include: Blood Pressure and Heart Rate Spike: Upon waking, the body releases higher amounts of stress hormones like cortisol and best cardiac doctors in bangalore adrenaline to prepare for the day, which causes a rapid increase in blood pressure and heart rate. 'Stickier' Blood and Clotting: Platelet activity (which causes blood to clot) is higher in the morning, while natural clot-dissolving activity is reduced. Dehydration: Several hours of sleep without fluid intake results in thicker blood, making it harder for the heart to pump and more prone to clotting. Vascular Stress: Blood vessels are stiffer in the morning, increasing resistance and putting more stress on the heart. Plaque Rupture: The combination of increased blood pressure and stiffer vessels makes existing plaque in the arteries more susceptible to rupture, which then triggers a clot.