I play more at night because my kids are asleep. Occasionally I get a chance to play while there is daylight out, but those times are rare and even then, I usually have something more important I should be doing
I'd consider myself a nighttime player, but I usually start playing in the evening, before the sun goes down. I kinda just play whenever I have free time, so it could be either day or night, but leans more towards night on a regular basis.
99% of my Halo 5 shots are taken at night. So I don't get to cash in on the Summer Boys. I did get to play on a Sunday during the day once and it seemed WAY easier. But I do realize I am a Diamond or low Onyx guy. If I was a high Onyx or Champion I would somewhat fear the daytimers since most of the professionals play and stream during the day.