This summer I am flying into YYZ on AC2. The flight gets in at 4:30ish in the afternoon. The following morning I am flying back home, in the States. Since the flight is so early in the morning I don't want to stay the night in the city. Also, I am a pretty cheap guy. I don't want to pay for a hotel room at the airport.

I do plan to leave the airport to go and see Toronto. What is the latest I can come back to the airport (that way I could crash at the gate)? I will have access to the Maple Leaf lounge. I considered sleeping in the lounge. Is this possible?

Are these ideas crazy? What should I do?