Waking up with a puffy face is fluid, not fat. Lying flat for seven hours lets water settle into the soft tissue around your eyes and cheeks, and last night's dinner decides how much of it there is. Cold is the fastest way to move it. Gentle massage moves the rest. Most of it drains on its own within an hour or two of being upright, so the real goal is to speed that up and give your face less to drain tomorrow.
