"Cyclical" ADHD?

Sometimes I can't help but think that this ADHD thing is "cyclical" to some degree.

There are weeks/months when it seems like I am barely affected at all, and then there are weeks/months where it is all but impossible for me to focus on anything, even for a few minutes. It makes me wonder how the human "natural cycles" plays into the condition.

Haven't really found much discussion or documentation about this aspect of ADHD.

Of course, just because something hasn't been "discussed" doesn't mean it doesn't exist. Then again, it's entirely possible that there's no connection and "it's all in my head." Or it could just be a reflection of my natural tendency to "think too much."

Still... when I look back at my years in school, there were also periods back then when I was clearly bale to stay more focused and get my studies done. And yes, I am pretty sure I am not Bipolar.

It's all a learning process, I suppose. Being aware of the "cycles," and the fact that my ability to stay focused moves in cycles... teaches me that I must make efforts to "make the most" of periods where I am able to concentrate.