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- Sleep it off. To be an efficient fat-burning machine, your body requires at least eight hours of sleep a night. If you think that you’re doing yourself a favor by sleeping less, you’re mistaken. Give your body time to rest itself, both mentally and physically. Sleep is very, very important (if only for mental alertness for the following day). If you feel tired, that’s likely your body’s way of saying: “Shut your eyes, stupid!”