Siri will be able to turn on night mode on Apple Watch via voice command

The Apple Watch has a hidden feature to activate Night Shift via Siri, which a Reddit user recently discovered. This changes the display, making it dimmer and more yellow to reduce blue light exposure.

Here's What We Know

This option is only available through the Siri voice assistant and does not yet have a corresponding switch in the Apple Watch settings. There is currently no official documentation regarding Night Shift support on Apple Watch, and it was not previously a change in watchOS 10. It is possible that this update will appear in future versions of watchOS.

Night Shift is not available on all Apple Watch models, and Reddit users have reported that they are unable to activate it on the Apple Watch Series 5 and older devices.

Source: Macrumors