Night mode is an automatic setting which takes advantage of the new wide-angle camera that's in the iPhone 11 and 11 Pro models. It's equipped with a larger sensor that is able to let in more light, allowing for brighter photos when the light is low.
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Apple Watch Series 4 Fall Detection Feature is Off by Default Unless You're 65+
As it turns out, Fall Detection is disabled for most users and will need to be manually enabled. In an Apple support document found by a Reddit user, Apple explains that Fall Detection only turns on automatically if you've set your age on Apple Watch or in the Health app and you're over 65 years old.
If you are not over age 65 and want to use Fall Detection, it will need to be enabled in the Emergency SOS section of the Apple Watch app.
Apple's support document also explains other aspects of the Fall Detection feature. When the Apple Watch Series 4 detects a "significant, hard fall" with Fall Detection enabled, it taps you on the wrist, sounds an alarm, and displays an alert.
From the options that display on the screen, you can select either "I fell but I'm OK," "I did not fall," or "Emergency SOS" to contact emergency services.
If the Apple Watch detects that you're moving, it will wait for a response, but if you're immobile for about a minute, it will begin a 15-second countdown before automatically calling emergency services and alerting emergency contacts that are set up in Medical ID in the Health app on iPhone.
Fall Detection in the Series 4 was tested over the weekend by multiple YouTube channels to see how the feature works and how hard of a fall is necessary to cause an alert.
Test falls onto softer surfaces like foam or carpet didn't seem to trigger the Fall Detection feature, but harder falls onto less forgiving surfaces did appear to work better. YouTube testers were not able to get the feature to trigger with each and every fall, suggesting there's some margin of error, which users should be aware of.
Apple says it gathered data from thousands of people over a period of time to create the Fall Detection algorithms, which are able to test both forward facing falls with wrists out and backward facing slips with wrists up.
Apple does warn in its support document that the Apple Watch Series 4 won't detect all falls, and also says that false positives are possible. "The more physically active you are, the more likely you are to trigger fall detection due to high impact activity that can appear to be a fall," reads the document.
Given the possibility of false positives for active adults, most people will likely want to leave this feature disabled, but it's a good idea to know how to turn it on if you may need it.