A therapy developed in Japan called waon, or soothing warmth, has proven effective in patients with severe heart failure and chronic fatigue syndrome. The approach has also shown promise for other difficult-to-treat illnesses. Patients take a dry sauna at a fixed temperature for a set amount of time to raise their core body temperature by about one degree Celsius. We'll look at waon's benefits and why it works. And we'll share some simple warming tips to try at home for better health.