Why do we feel 'pins and needles' when a limb 'falls asleep'?

When you sit cross-legged for too long and your leg goes numb, it feels like someone is poking it with pins and needles, and that’s no accident!

Imagine your leg is like a phone cord, all twisty and bendy. Inside it are tiny message carriers called nerves, which help your brain talk to your foot (or hand or arm). When you sit in one position for too long, those message carriers get squeezed, like when you wrap a rubber band too tight around a pencil.

Once the pressure is gone, maybe you stand up or shift your weight, the message carriers pop back to life. They start sending urgent messages: “Hey brain! We’ve been squished for ages!” Your brain gets confused and sends out extra signals, making your leg feel like it’s being tickled by tiny pins and needles.

It's like when you wake up after a long nap, everything feels extra lively at first. That’s why your leg feels all tingly and alive again once it “wakes up”!