RMMV How can i adapt day/night system to a parallax map with GALV_LayerGraphics?

[Ykkur]

Hello, as title says, im making a game where have day/night system, i have a parallax map for day (base map, and other for shadows above the base map) and then a night parallax map with lights and shadows, but i dont know how can i make it work, how can i make parallax change from 'day shadows' to 'night lightning'.

I dont know if i explain my self, sorry, english is not my native lenguage.