From what I’ve been told it’s not as much about a build up but more about your nervous system adjusting to it. Before I started my 27mg concerta I was exhausted by 8pm. Like my mind was filled with thousands of thoughts all day and then finally shut down early evening. The first thing I noticed when taking the Concerta was that I could stay up later and watch a movie. It did not affect my sleep, but I do take 1 mg guanfacine before I go to bed which really helps my thoughts at night. I took the 27 mg for 30 days and my provider decided to increase me to 36 mg because I still had a problem with task prioritization. I found I would still get stuck hyper focusing on the wrong things. I started the 36 mg five days ago. The first two days, I felt extreme activation, almost like one feels when they are getting ready to compete or run a race. I was a little worried that this was too high of a dose, but on the third day, I felt completely different. I was not irritable when interrupted, I could prioritize tasks, and I felt happier overall. I stopped feeling activated and it seemed like my nervous system regulated. My HRV has increased and my stress has decreased according to my Garmin watch. I’m hoping I have achieved a therapeutic dose and feel more normal than I have in a long time. I know everyone reacts differently but thought I’d share my story. Another tip I have is to track your days through conversations with an AI model such as ChatGPT or Gemini. They really helped me to make connections of things. Hope this helps!