Hello there,
I am looking at an overnight connection in YYZ from DCA-YEG (landing at 10:15pm and departing to YEG at 8ish AM) in Business Class. It's a USA-Dom connection so I will be passing through immigration. I am curious if I could stay airside in the domestic terminal after crossing immigration at YYZ.

I don't want to get an overnight accommodation away from the airport. I would prefer staying inside the terminal overnight and heading to the Maple Leaf lounges at 5AM when it opens up.