It really does, and I agree with you. Sometimes, it's best to rest and come back when you can do your best work.
I find that I go through very noticeable ups and downs in terms of writing content. I'll have a day or two in which I write the first draft at least of several different articles, and then I'll have a few days when that just isn't what my brain is working on. I've started to find it helpful to try to accumulate a line-up of content in those up periods that I can continue to put out in the down periods.