I added a gradient map layer, using a custom blue colour palette and reducing the opacity to 80%.
I then added a curve adjustment layer to darken the shadows and midtones.
After this, I added a levels adjustment to darken the image further so the image appears to be taken at night.
I then used the quick selection tool and inserted an image of the night sky. I did not like the final result so I reverted back to my previous edit. I wanted to explore having various times of day through the images however I was limited to the amount of time to take these shoots. This is why I attempted to do this in post production.