The Yeelight Night Mode handling (in both the official yeelight app and Home Assistant) has always been a hassle for me.
Why have two separate modes to control the brightness of one lamp?
A few months ago I had a different setup with Homebridge and the Yeelight Integration there does a phenomenal job of giving the user just one universal brightness slider. With both night mode and normal mode combined.
Just one simple slider that automatically switches to nightmode at a specific threshold.
I think it would be a great and simple feature to implement the option to have just one slider for the whole range of brightness control.