Sorry for the lack of a reply, I was at work!
@
canadiancow the 3am flight was removed last fall, but lately, we have been getting an AC (sometimes rouge) flight that arrives around 2:30am.
The lack of a true redeye for YYZ-YYT is interesting considering it could technically work. Leave YYZ around 12:30am arrive at 5am (sunrise during the summer!). Not that I would ever want to take it unless I had no other choice, but it would certainly work well if you had late connections from western flights.