Getting enough sleep is not only good for your health and productivity, it's also good for the planet. But how green is sleeping? TreeHugger thinks it's actually pretty good. If you think about it, it makes sense:
Another Reason to Sleep: It's Green
But how much energy can sleeping more really save?
Energy savings also depend on the time of day you sleep. I definitely suggest reading the entire post, 'What's the Carbon Footprint of Sleep?'