It's weird: If I have a day I really overdo, I either am really tired then, or else it hits me bigtime the next day, and I can't accomplish a thing.
But often, several hours later, and usually in the evening, I do get a second wind (maybe over the hurdle of fatigue?) and yes, my body won't shut down.
Am trying hard not to overdo, because I get weary of the rollercoaster ride!