Why does your leg feel like 'ants crawling' when it's numb?

It's not 'poor blood flow,' but a signal from your nerves 'recovering from suffocation'! Many people think leg numbness is due to poor blood circulation, but strictly speaking, it's primarily caused by 'physical nerve compression.' When you maintain a bad posture, the peripheral nerves in your legs, like a stepped-on water hose, can't transmit electrical signals properly, causing your leg to temporarily 'lose sensation.' The moment you release the pressure by changing your posture, the nerves and surrounding blood vessels regain oxygen and blood supply. Nerve cells then start explosively firing a large number of weak electrical signals to 'reboot the system.' These chaotic, irregular micro-electrical signals transmitted to the brain are interpreted by your visual and tactile nerves as an abnormal sensory experience of 'countless tiny pricks or crawling ants'!