You can press the SPEED button one or more times to select the Sleep mode. In Sleep mode, the Philips Air humidifier operates quietly with dimmed light for your undisturbed sleep.
•The Sleep mode only works at the lowest speed.
•In the sleep mode, the red indicator does not blink, but remains on when the water level gets low.
•In the sleep mode, you can only set the timer; the humidity level cannot be set, and the humidity light is off.