If you are fully hydrated before going to bed and sleeping, you lower the risk of stroke and heart attack.
Dehydration elevates the risk factors for cardiovascular disease, specifically heart attack, and stroke.
A heart attack occurs mostly in the morning because the blood is thicker caused by loss of water.
This is a good reason to drink water at night to keep your body hydrated while you are sleeping.
2. When you wake up
If you sleep for 8 hours, that means you are also not drinking any fluids for 8 hours, and your body slowly becomes dehydrated. Drinking water before eating anything aids in cleaning your colon and helps the body to absorb more nutrients.
Four cups set your body in motion for the production of hematopoiesis, which is new blood.