I have heard this thing from many people that their best time of writing is at night. I do not know the reason but I think that they may feel that at night, nature is quite and there is less sound pollution to deal with if you live in a city. As for me, I am more of a night worker. I don’t know how I can change my sleeping habit. I wish that I could do it but it is very difficult. At day, interruptions are easier to happen. For example, a guest may come to your home. You may have to do the shopping and cooking. Then there is the sound of cars all the time if you live in a busy neighborhood like me. However, at night, there is less distractions. In fact, it is now 5 AM my time in my city and there is no sound at all. So, I can concentrate on my writing better. The only problem is that I have started to feel sleepy.
I don’t think that night is the best time for writing. I think that if possible you should try to work at day time because it is the natural thing to do. If you are awake at night all the time then you just make your health weaker day by day.