Why does my Asus PB277Q screen keep waking up while the Mac it is connected to is sleeping?

Solution 1:

This is because this monitor is for 75 hz but in high sierra or later I think this feature not work good now, I have this monitor and I have this problem, but you can use this monitor with your make, you go to display settings, select this monitor and change HZ 75 to 60 and it's works good.