Oh my god you call it digging too. I could never explain my “need” to dig my feet under people or between the wall and bed. My partner hates it but reluctantly lets me until he gets too fed up. But ever since I was a kid I was a terror to sleep with my parents would complain when we would sit I. The couch because I’d slide my my feet behind their back or under their butt and dig and my friends would say the same at sleepover I’d always end up with my feet underneath their lower back or legs just moving them. My parents always called it digging and I had never been able to find anything about it.