5. Don't Finish That One Last Little Thing
In the last 15 minutes of the workday, it's so tempting to squeeze in one last little thing, right before leaving. And yet you can—and should—resist. First, a last little thing is, by triple-super-scientific definition, not 15 minutes. It's 20 minutes on Monday, 30 on Wednesday and 2 hours and 47 minutes the day before vacation.
You'll either end up staying late or leave with it half finished. Further, you'll have wasted that snippet of time at the end of day that could have been spent organizing a plan for tomorrow. And without that plan, you're ensuring tomorrow will be one long snarled game of catch-up. There is no need for any of this. Get out of there! Hug somebody! Eat something with green stuff in it! Fall asleep, get up and don't do any of these things at work all over again.