Sleeping longer than you need to will weaken your sleep system, as you reduce your prior wakefulness, exposure to sunlight, activity levels, and your body temperature at a low for too long.

For any system where you have quantized level, you can always eventually get to a low enough temperature that you're in the first limit.

In theory, such a system would save on heating and cooling bills by exposing computers to low-temperature offices while exposing office workers to the warmth of the computers.