Create a whimsical and dreamy 3D render featuring a young girl with long, wavy blue hair, peacefully sleeping on a crescent moon. She is dressed in a stunning white gown adorned with intricate star patterns, embodying a celestial aura. The serene night sky enveloping her is filled with shimmering stars, enhancing the magical ambiance of the scene. Soft clouds cradle the girl, while a few vibrant yellow flowers add a pop of color and warmth to the composition. The phrase "Sweet Dreams" in gold script shines brightly, each letter accentuated by a unique, glowing star. This enchanting artwork exudes a sense of dark fantasy and ethereal beauty, perfect for a cinematic poster, fashion illustration, or any creative project aiming to evoke a dreamy and tranquil atmosphere.