Whe sometimes I sleep on my one of my arms and they go numb, when I reposition and I start to feel it it comes with immediate and excruciate pain that luckily d

Whe sometimes I sleep on my one of my arms and they go numb, when I reposition and I start to feel it it comes with immediate and excruciate pain that luckily dies in intensity after a few moments. I wonder if this is just compressed nerves or it’s the blood supply that was cut off.