You breathe about 20,000 times a day and almost none of them get any thought at all. That's normally fine, until how you're breathing starts working against you. Most people breathe through the mouth, into the chest, faster than they need to. It feels automatic because it is, but it's not neutral. Mouth breathing and over-breathing keep your nervous system a notch more wound up than it needs to be, all day, without you noticing. There's a simple way to see where you sit called a BOLT score, basically a breath-hold test that shows how well your body handles a build-up of carbon dioxide. Lower scores generally line up with more stress and worse sleep. Higher scores usually mean a calmer, more efficient system. Here's the test: 1. Sit quietly and breathe normally through your nose for a minute or two. 2. After a normal exhale, pinch your nose and start a timer. 3. Hold until you feel the first real urge to breathe, not until you're desperate, just the first clear signal. 4. Stop the timer and breathe normally again. That number in seconds is your BOLT score. Under 20 seconds usually means there's room to improve. 20-30 is decent. Above 30 is strong. Do it once now, then try it again in two weeks after focusing on nasal breathing through the day. Most people see a real jump from that one change alone.