Hello guys, I once again come to ask of a concern that has been worrying me for some time. Last semester as I took much lighter coursework, I had the luxury of having a lot of time to figure problems out, and only consumed a can of energy drink before tests for the assurance. I felt that I was a competent and creative problem solver, and in general was able to think vastly and a lot. This semester however, a drastic increase in coursework forced me to drink caffeinated beverages at a near daily basis. As the end of year's approaching, my brain feels restless and lethargic, and I'm afraid that it has lost its function to think. My plan for recovery is to take 3-weeks off during summer not doing any heavy mental exercise; focusing on rehabilitating my health. I'm sure the struggle with caffeine is a very common problem among the physics community, and I would like to know your experience with the substance: what is your story with caffeine, and how do you try to maintain healthy mental conditions now? I hope this thread, with the help of your input, remains useful for many current and future users in the times to come. That being said, thank you greatly for sharing your experience that will be helpful to many of us.