Leg falls asleep after uncross legs

For a long time I have had this odd symptom. I sit down and cross my legs, where pressure from my knee is put on my calf or upper leg depending on how I am sitting. I am fine while I am sitting there but after I uncross them, which ever leg was on top will go all pins and needles. I don't see how this could be circulation since it doesn't happen while the legs are crossed. It seems like I put pressure on a nerve and that releasing the pressure triggers the pins and needles. This doesn't make sense to me and is worrying me. Does anyone else get this?

Hi J2 I don't know what causes it, maybe blood flow restriction. I get this all the time most days actually, even more so when I sit on my legs I have a bad habit of sitting on my legs or crossing them especially when I'm anxious. Some times it can take quite a few minutes for the pins and needles to go.
Take care
Ann

The pins and needles sensation is all the blood flowing back after the leg has had the blood flow restricted for a while....... if you completely cut off the circulation to something it goes numb. Nothing to worry about!!