I always play in my free time, whether night or day. But mostly at night. I work in the afternoon and early in the morning I sleep. Overnight I'm with my best friend and we mostly play poker together
I play mostly in the daytime, I get tired at the end of the night and I can not play carefully anymore, and I live not alone I do not want to stop the family from sleeping.
I play mostly at night because of two reasons:
1) I am a night person. Really.
2) I'm a Russian player so it's better to play at night for me (there're more players at night in poker rooms & there're more good freerolls).