bad circulation

I don't know what is going on with this lately but I will be sleeping with my arms by my side and my legs straight out or I'll sleep on my side and my arms will be tucked underneath my pillow but somehow my arms and legs will fall asleep so bad that by the time I get up in the middle of the night to use the bathroom I have to use my other hand to hold the other one up because I can't feel it or I'll have to start moving my legs a lot to get the circulation to get the blood flowing again.. it freaks me out honestly.. what if I never wake up in the middle of the night and I sleep the whole night with no circulation getting to my body parts? is there any way to fix this??? hahaha this is such a stupid question because obviously you can't tell how your body is going to change throughout the night, but I know my body won't allow me to sleep on my tummy anymore and I almost never sleep on my back so it is either left side or right side.. any suggestions?