How does "Sleep Mode" on a fan work?

This function allows the unit to be set in Sleep Mode. Pressing the Sleep Button once will set the unit on Low for 6 continuous hours. Pressing the Sleep Button a second time will reset the unit to 6 continuous hours. The Oscillation Button will function when the Fan is in Sleep Mode. Pressing any other button (Timer, Fan Speed or the Power Button) will shut off the Sleep Mode.