At the end of the semester people starting telling me how tired they were. It had been an exhausting semester. I agreed with them, but I ultimately felt that these conversations ended up having a negative effect on me. I kept telling myself how tired I was, how burnt out. I almost deliberately didn't do some writing I had planned to do, but it turned out that the effort of not working made me more tired than ever before. I wasn't not working and enjoying myself, just doing less during the same number of hours in the office.
So when you hear this kind of chatter, how busy, how tired we all are, beware of that insidious form of peer pressure. You can acknowledge that someone else's feelings about this are legitimate, but you don't have to buy into the mindset. Repeating to yourself over and over again, "I'm so tired" will tire you out even more quickly, because the language you use to describe your body will have an effect on it.