I'm not sedentary although I don't currently have an active fitness routine. I have maintained a weight and BMI within the typical recommended range with relatively no effort throughout my adult life. I tend to pace or walk a lot during the work day instead of sitting. Especially when thinking about problems. The last time I had a dedicated exercise routine before I was on medication tended to increase my afternoon drowsiness when I exercised in the morning before work, and had no noticeable change on it when I exercised in the evening.

I recently went through a month of physical therapy because of a back problem. That had me doing a light cardio workout 30 minutes per day three times a week (plus stretches and such on the off days). I was still taking my prescription during that time, so I can't say with certainty how that would have affected me, but there wasn't any noticeable change in my energy levels or sleep needs.

An afternoon nap or two is almost a necessity on any day I'm not taking my prescription. I can't say as I have ever tried specifically scheduling them into my work day though. Napping tends to be something I resort to when I can't shake off the drowsiness by walking or a snack.