I play more during the day, but we certainly need to adapt to times when our mind is very focused, eg when we wake up our mind is very confused and this is a horrible time to play, surely as you play at night your body is already fully awake and certainly you have already accomplished all your tasks and are much more relaxed.
I think the point is that even playing when we're good, and for regular grinders to work a lot in this area of routine to adapt the best schedule to perform well at the tables.