Generate a vibrant cover image with a bright, inviting atmosphere. Incorporate plenty of white and cool hues to convey a sense of calm and tranquility. The image should evoke feelings of relaxation and wellness, suitable for a sleep clinic brochure. Use soft blues, greens, and purples to create a soothing ambiance, and include elements such as clouds, moonlight, or stars to signify a peaceful night's sleep. The overall composition should be clean, modern, and visually appealing, with a focus on promoting a sense of well-being and serenity. --ar 4:9