It can also be totally normal to get drowsy after a meal…this is because some of the blood in your brain travels down to your intestines/stomach to help digest the food…maybe you eat less in the evening, or different food? Also, in the day, you have already spent quite a bit of your energy…and that it typically Adhd…to get tired…I get this drowsiness too, nothing to do with Adhd.Good luck to you.