According to energy efficiency expert Michael Bluejay, while in use, the average laptop requires 15-60 watts, while desktops use 65-250 watts, plus an additional 15-70 for the monitor. In sleep mode, however, most laptops use a measly two watts, and desktops with monitors use 5-10 watts, says Nordman. ("Hibernate" modes on some computers use even less energy—for a good rundown on the difference between various power management modes, check out Michael Bluejay's guide.) Because sleep settings use so little energy, Nordman believes that it isn't really worth making a big production out of remembering to shut down your computer every day: "Much more important to make sure that your computer is set to go into power-saving mode after a certain period of idle time."
Me, I shut it down, because I lost my hard drive during an unexpected thunderstorm...not to mention that the cats love to sleep on the laptop.
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