I Have Noticed If I Sleep With My Left Leg

I have noticed if I sleep with my left leg bent at he knee my foot all the way past my knee goes to sleep. I hae to sleep with it straight. Should I be worried about this? I wake up and have to get it moving. I feel no sensation until I get it moving and it feels like when your foot goes to sleep just all the way up past the knee. This has happened to my arm too. Thank you
Judy
YYYY@YYYY