I booked this for late August.
I had the choice as it was a paid ticket. But when I have flown the evening flight, I find it very discombobulating. The flight time is too short to get a proper sleep in and the time is shifted just a bit off of what would be ideal for an overnight.
I like the Turkish flight from YYZ to Instabul, leaving at 11pm and 10+ hour flight. Oh ... that is sweet, sweet candy for J.
So for me to fly during the day, getting up early on the day of the flight helps in adjusting to the time anyway.