Tag: Blood oxygen levels drop when we fall asleep

During sleep, our bodies release carbon dioxide (CO2) into the air. This gas helps keep our lungs clear by making the mucus that lines them thicker. As CO2 builds up in the body, it causes the blood vessels to constrict, which lowers the amount of oxygen available to cells. How Much Oxygen is in Our Bodies? We need oxygen to live. It’s an essential component of our bodies. And yet, we only...