I am more active at night for some certain reasons. In my country Nigeria power outages are common and random with no pre warnings. Electricity supply is more constant and consistent at Nigeria. I stay on the internet a lot and requires electricity supply, so the night is the best time for me to work without interruption.
Another reason is the calmness and quietness the night offers me, almost everyone is sleeping and there are less people and vehicular movements. It gives me better concentration and less distractions.
But I must say staying up at night too much is not good as it can cause sleeping disorders because your sleeping pattern is changed randomly. Nature designed humans to work during the day and sleep at night.