How do I use the SLEEP mode function?

Press the sleep button to initiate sleep mode. While in this mode, the selected temperature will increase or decrease by 2°F (or 1°C) after 30 minutes, then increase or decrease by another 2°F (or 1°C) after an additional 30 minutes. This new temperature will be maintained for 7 hours before returning to the originally selected temperature. After the 7 hour period, sleep mode automatically turns off and the unit continues operating as originally programmed.