What time do you work on your fanfics

For some reason, I can only write my Soap/Ghost fic between 12:00 am to 4:00 am. It suck because I'm tired during it, and I make a lot of mistakes, but I literally can't write it any other time. But what's weird is that I could have written my Scout/Sniper fanfic whenever before I finished it. I was wondering if any of you were the same. Have a nice whatever time it is for you.