[header] How to make yourself light headed [title] Crouch. [step] Bend your knees and get low to the ground. Hang your head low. 
When you stand up quickly after you've been crouching, sitting, or laying down for a while, the blood rushes from your head, and your brain is momentarily knocked off of its usual equilibrium. If you haven't been sitting or laying down for long, try crouching down and breathing rapidly to simulate the process.