Hi Thorn,
Just clarify, is your computer has the Insider build of Windows 10 or are you already using the public release of the Creators update?
If you want to activate the night light function of Windows 10, you can do so by accessing the Display settings or you can activate it through the Action Center. You can manually activate or deactivate the night light, or you can schedule the activation and deactivation of the night light.
If you want to have a keyboard shortcut for the night light function of Windows 10, we recommend you post this as a suggestion on the Feedback hub application so that our Support Engineers can review your suggested function and add it on the future update of Windows 10. You can easily access the Feedback hub by searching it using Cortana.
If you have any questions, kindly reply to this thread.