Quora user asks if water before bed prevents heart attack and stroke; doctor answers

A Quora user asked if drinking water before bed can prevent heart attacks or strokes. A doctor explained that there is no solid evidence supporting this claim. Cardiovascular health is more closely tied to overall hydration, blood pressure control, cholesterol management, diabetes management, regular exercise, and a heart-healthy lifestyle.

Dehydration can increase clotting risk, but a glass of water before bed doesn't significantly thin the blood or offer special protection. Overnight mild dehydration is generally not a trigger for heart attacks or strokes in healthy individuals. The concern is avoiding inadequate hydration rather than focusing on a specific bedtime ritual.

Drinking more water at night can lead to frequent bathroom trips, disrupting sleep and indirectly affecting cardiovascular health. For people with heart failure or kidney disease, fluid restrictions should be followed by a doctor's advice. Having a glass of water if thirsty before bed is generally fine, but it's not a proven preventive measure for heart attacks or strokes.

For overall cardiovascular health, maintaining consistent hydration throughout the day and managing established risk factors are far more important than the timing of the last glass of water.