Depending on your point of view, there is nothing more (1) entertaining or (2) miserable than McCarran on an early Sunday morning. Whether you choose 1 or 2 depends on how much you've had to drink the night before.
The obligatory slot machines remind you that you are in Vegas. Wi-fi is free and the signal is decent, they sell a LOT of Gatorade, coffee and coconut water, and the power outlet situation is hit or miss.
There tend to be more people crawled up in little balls on the ground, though. And lots more people wear sunglasses indoors. Oh, Vegas.