I want to make my secondary monitor darker so it doesn't burn my eyes late at night

I have an HP 24yh monitor for my XPS 9300 laptop with Window 10. I want to keep working late at night, but my monitor is super bright, even when I set the color control to the night setting. I can't find any options on my laptop either. Is there a good custom RGB I can set it to? Are there any settings on my laptop that I am missing? Thanks for any help.