Depending on the situation, we like to call that an "Afterglow".Everyone does. It is not the same chemical hitting your brain that you experience with vaping or smoking.
I‘d also contend that some of the “boutique” cannibanoids contained in some hemp derived THC product are significant contributors to next AM brain fog.
But you are 100% accurate in my experience. Minimal affects in the morning from MJ derived THC vs a cloud that can last until 8 or 9 sometimes from hemp for me.