Listen to music. It evokes emotion and engages many parts of the brain. It will cheer you up a little bit.
Listen to music that energizes you. Maybe try dancing or singing along, or at least just shaking your head to the beat and mooing softly under your breath. A little annoying or not-so-pleasant music is preferable to familiar and pleasant music in this situation. Just wear headphones, it's not your colleagues' fault!
Listen to music quietly. According to a common misconception, loud music helps to stay awake, but in fact it will be more effective if the music is played very quietly, which will make you listen more carefully. If it's hard to understand the words, that's just what you need - your brain is working and the volume is just right.
Get Interested! Interest can work as a distraction. When we are interested in something, our brain stays focused. Interest can be shown in work-related moments as well as in what's going on in your environment.
Make sure you have a source of bright light. Bright daylight is best. Your internal clock (circadian rhythm) is regulated by the influence of sunlight, that is, if you make your body believe that it should be awake now, you will not fall asleep, even if you are very tired.
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