A sunset projection lamp is a type of lamp that projects a sunset-like image onto a wall or ceiling. These lamps are often used to create a relaxing atmosphere in a room, and may be used to help people fall asleep at night. Sunset projection lamps typically feature a range of colors that gradually change over time, starting with a warm, orange glow and gradually shifting to a cooler, blueish hue. Some sunset projection lamps may also include additional features, such as the ability to play music or adjust the brightness of the light.