Modern gaming consoles consume more and more power, dissipate more and more heat and cause a lot more noise with their cooling systems compared to their brethren a decade ago.
While it's obvious that an Xbox 360 would have higher energy demands than a Playstation 1, the curious question is by how much? Even more importantly is the question of whether your console might be costing you money while you sleep. Preposterous you say? Actually quite the opposite!