The cemeteries are filled with people who thought the world couldn’t get along without them
— Multiple sources, original author unclear
As you start the new year, please take a moment to remind yourself that whatever you do and how good you are at it, your employer (and society as a whole) will continue to function with or without you. This means that you should never be ashamed or feel anxious about taking “off” time, and by that I mean all of the time allowed by your employer every year. Not only will you get more productive overall, your friends and family will thank you for it. I certainly expect all of my students and postdocs to take time off.