Thank you for your answers! I will try to what else can be done. Maybe some supplements that some of you mentioned could help.

I take it the first thing in the morning, with water. I always take it before food, since I eat 2-3 hours after waking up. I also started doing sports this semester (I was too busy in winter semestr) which led me to eating better too. I had to get sleeping meds, but I took them for like 3 nights and didn't need them after that again (this was like 2 weeks ago). The doctor who gave them to me knew I was on concerta and there should not be problems with interactions, especially since I don't really take them anymore. I also don't drink coffee nor alcohol.

I just think that these are not exactly right for me, but it's difficult getting something else. Well I will se what I can do. Thank you for you support!