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Prep your house for easy energy cutbacks at night. Before heading to bed, dial back your thermostat. According to the U.S. Department of Energy, setting your thermostat 7 to 10 degrees cooler than its normal temperature for eight hours per day could slash 10 percent off your annual energy bill and use less resources. Plus, ample research suggests you will sleep better in a cool room. Sleep scientists from the University of Pittsburgh School of Medicine, for example, found that insomniacs who slept with a cooling cap slept almost as well as people who had no difficulty falling and staying asleep. Reducing fossil fuels and improved snoozing? Now that’s a sweet dream.