Set an Alarm
If you're dead set on buying a specific model, you might want to set an alarm, just to be safe.
If you plan to go to sleep before pre-orders start you'll want to set an alarm, maybe even a couple of alarms, to make sure you're awake and functional before pre-orders open up.
Setting an alarm on the iPhone is easy. Pull up Control Center, tap on the Clock, and set an alarm for 4AM-4:30AM Pacific. This will give you plenty of time to get ready.
If you hate the stock alarm clock, or you've been having problems with it, take a look at our list of the best iPhone Alarm Clock apps.