the first ld i ever had was one of the first times i remember falling asleep/waking up on my back (can’t be sure exactly which/both). i sort of convinced myself that lding came more naturally while i was asleep on my back. then i’d have one waking up on my side, so i guess that’s out the window. 
tosxy, i definitely am gonna have to try and keep track of whether i’m waking up on my back, side, etc. i think that is also gonna help me stay put when i wake up