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What happens here is that your cells run out of oxygen, you run out of energy, and your muscles feel sore due to the lactic acid dumped into the muscle tissues by your cells. What the body's cells are pretty convincingly trying to tell you here is- stop exercising or we will die.
So when you are tired, a full body stretch sends a lot of oxygen to your muscles and gets you ready to move around. It also redirects oxygen from your brain. When your brain gets less oxygen, it shuts off less vital functions. You get lightheaded and dizzy. Then the brain needs to redirect oxygen flow to the brain to correct this. That's why you may find that you have to stretch a few times.