Abstract: An event triggering method for triggering events during a sleep mode for use in a mobile device is provided, wherein events includes at least first and second type events. First, an event manager operated in the sleep mode is provided, wherein event manager includes a counter. Thereafter, second type event registers to event manager a periodical time period. Upon receiving a request for triggering the first type event, it is determined whether to trigger second type event together with triggered first event according to a counter value counted by the counter and time period registered by the second type event; wherein second type event is determined as not being triggered when counter value is less than time period registered by second type event and second type event is determined as being triggered when counter value is equal to or exceeds time period registered by second type event.