The symptom you mention is due to an event in the calendar that is in one year, and the the notification for it is in another. In other words, if you have something on the calendar for Jan 2, and you have it alarm 3 days prior, it will cause your palm to turn on as you describe.
Also, having the USB plugged into a powered PC at the same time the charger is plugged into the wall eventually destroys the charger. Go figure, but it has happened to several and the consensus is to never have them both plugged in.
Too bad Sony pulled out. I'm very pleased with my NZ90. I'm considering the Asus PPC for her now. I think Palm is in trouble and therefore the PalmOS, as superior as it is, will suffer too.
I just bought a T5 for my wife that I'm returning immediately. DOA from palmOne store and research on their forums indicates more problems that I feel comfortable with. When I wrote for technical assistance, they replied, "Please call this number (not toll free) to coordinate the repair of your device" IMO , a DOA unit deserves a cross shipped replacement. I have to turn my back on Palm; too bad.