any of you on here fly your drones at night ? What do you think about it ? which do you think is more fun night flying or day flying ?

There are some who can, and others who are forbidden by local laws.
I personally love it myself, and there are numerous threads already on this topic. ;-)
Picked up a set of these LED lights for my Phantom 3 Pro', last week.
https://www.lumecube.com/shop/lume-cube-phantom-3-kit
A cool way to get better lighting for your pics and video capture.

Pretty bright...

RedHotPoker

Yes, it's equally fun, if not more so, for me. Ha
Seriously love flying after dark sets in. Especially with these new LED diodes burning bright.
https://www.lumecube.com/shop/lume-cube-phantom-3-kit
But there are several other threads on this, in here, already. ;-)
http://forum.dji.com/thread-53947-1-2.html
http://forum.dji.com/thread-53980-1-2.html
http://forum.dji.com/thread-59919-1-1.html
http://forum.dji.com/thread-59952-1-1.html
http://forum.dji.com/thread-60034-1-2.html

Yeah, night flight is all right, with me. Hehe

RedHotPoker

To shoot video of a bridge at night, I do that:
During the day I record waypoints and, at night, I run the mission with the "free" option to head the camera in the best direction while flying. That avoids collision problems and the automatic light control of the camera functions correctly. I just trim the light control manually to have a night effect on the videos.
I used 1920x1080 30 fps.
The Phantom remains visible thanks to her LEDs.