Question about Hisense TV 50E77NQ

The Hisense 50E77NQ TV has a function called "Eco Mode" or "Energy Saving Mode", but there is no specific "Sleeptime" function that automatically switches the TV off when it is not in use. However, there may be settings that can put the TV into standby mode after a certain period of non-use, but this is not explicitly documented as a "Sleeptime" function.