How does the Sleep Mode function on the WME Series thermostat?

When Sleep Mode is activated, after 1.5 hours the setpoint increases by 0.5°C in Cool Mode or decreases by 0.5°C in Heat Mode. Thereafter, every 30 minutes the setpoint adjusts by 0.5°C accordingly. Sleep Mode deactivates if power is switched off, the mode is changed, or the user adjusts the setpoint temperature. Once deactivated, the thermostat returns to the user-set temperature control. (Page 5)