How do I use the Sleep feature?

Press the Sleep button to activate Sleep mode. The display will show 'SL' for 3 seconds and the display brightness will dim to 25%. The unit will automatically select Auto fan speed, and the set temperature will increase by 2°F after 30 minutes, then another 2°F after an additional 30 minutes. This new temperature is maintained for 7 hours before returning to the original setting.