Set an Alarm
If you're gung-ho about a pre-ordering specific iPhone Xs model, you might want to set an alarm just to be safe.
If you plan to get a few hours of shuteye before iPhone Xs 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 start.
Setting an alarm on an iPhone is easy. Pull up Control Center (if you own an iPhone) and set an alarm for 11PM-11:30PM Pacific. This will give you plenty of time to get yourself and your devices/accounts ready to pre-order.
If you hate the iOS' stock alarm, or you've been having problems with it, take a look at our list of the best iPhone Alarm Clock apps.
If you own an iPhone, you might also want to set a Reminder via the Reminders app just to be safe.