If you want to maximize sleep time, there is a Sheraton hotel at Terminal 3 (AC/LH are at terminal 1). Normally there is a train between terminals but I believe it is closed right now so you'd have to go on a shuttle bus. The Westin Bristol Place is also quite nice but requires a hotel shuttle ride.
If you want to stay awake, you might also consider renting a car and driving to Niagara Falls if you have not been there. It is only about 1-1/4 hours from the airport. If you enjoy wine, there are also some decent wineries in the Niagara area (along with some awful ones).