As light air begins to fill in, you can shift some weight to leeward to help the boat to heel. Heeling the boat has a couple of advantages. First, the weight of the sails and boom help them to hang on one side, reducing the slapping of limp sails from an upright boat wallowing and rolling in the swell. Even the most even-tempered of us gets annoyed after days of listening to slatting sails, a slamming boom and rattling blocks. Even worse, shock loading of the sails, rig and gear during that light-air slapping can weaken gear and cause sails to self-destruct, blowing slugs off the foot of the main or blowing seams out of light-air sails. The second, and more important, advantage to heeling is that the more stable sails can now assume an airfoil shape that provides propulsion. Without use of a motor, your sails become your "engine," and to get you anywhere, they need to work. In light air, they need to be gently coaxed. Heel the boat to establish their shape. Minimize pitching and dont make sudden, jerky movements onboard, which cause the sails to flutter and lose what little efficiency they have at low speeds.