BB Bold :: Calendar Not Waking Up The Device?

I just went from an old blackberry curve 8310 to the new 9900 and the calendar doesn't wake my phone anymore. In my old 8310 and in the new 9900 are set to sleep and wake a pre-definied times in my old phone if an event is scheduled in my calendar the phone will wake up and the calendar event will ring but on the new one the phone sleep untill the pre-defined time and ring for the calendar event that was scheduled earlier(ie my phone wake up at 7AM but one day i set something in my calendar at 6AM, the new phone doesnt wake untill 7 and ring for the missed appointment that was scheduled at 6AM. On my old 8310 it would wake at 6 and ring for that event) My question Is:Can I change an option somewhere that I can set so that the calendar behave like the same way as my old phone and wake my device and ring when an event is scheduled and the phone is in sleep (I set up the 9900 to close and wake at pre-determined time and I want the phone to wake early if there's something in my calendar).