What cleaning levels are available and what is Sleep Mode?

There are three cleaning levels selectable with the Cleaning Level button: Microscopic Particles (quietest, optimized for small particles), General Clean (recommended for dust and everyday cleaning), and Pollen (optimizes pollen capturing). Sleep Mode sets the unit to the lowest cleaning level for ultra-quiet nighttime operation, dims control panel LEDs to 10%, and completely turns off the Air Quality Indicator light. (Page 6)