Why are your arms and legs numb when you sleep?

Numbness in the arms and legs during sleep often occurs due to pressure on nerves or blood vessels, which can restrict blood flow or nerve signaling. This is commonly caused by sleeping in an awkward position, leading to temporary compression of nerves. Once you change positions and relieve the pressure, normal sensation usually returns. If numbness persists, it may indicate an underlying medical condition that should be evaluated by a healthcare professional.