Write to support that you cant read? it was put right into the setting alot of players knew about it cuz they read it, and set there sleep mode before ti was put auto.
The sleep mode is explained in the Speed World Announcment thread.
Explanation for the sleep mode:
While your account is in sleep mode attacks on your villages do not take effect and will only visit. Production of troops, buildings and resources will also be paused in that time.
After being awake for 36 hours the sleep mode will be activated automatically. You can only enter sleep mode if have been awake for at least 16 hours and you have to set sleep mode at least 2 hours before it starts.
You may set a duration between 6 and 10 hours.