I have had some long days at work. Today I had 4 hour meeting. However, the meeting organizer was kind enough and had bought a "Semla" to each one of us. ("Semla" is a wheat bun spiced with cardamom and filled with cream, plus a type of marzipan).
During the time, then the "Semla" (and all of its sugar) allowed me to stay focused at the meeting, but now later when I am home, then I feel just tired. I think it is time to get some sleep. Good night / morning.