Don’t feel guilty about heading to happy hour tonight—just get at least seven hours of sleep before going back to the office, and your job performance won’t suffer. 

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Boozing it up (well, 3-4 drinks max for men, 2–3 for women) on a work night has very little effect on productivity the next day—but sleeping only six or less hours sharply cuts productivity, according to the surprising results of a Rand Europe Report on 20,000+ workers across the U.K.

Other factors—money woes, mental or physical troubles, even workplace bullying—also affected productivity somewhat, but nothing was linked to it as directly as lack of sufficient sleep.