ok this happend to me about 5-6 years go and has always kinda bothered me because i didnt have any explanation for it. I was about 8-9 years old and it was christmas eve. I went to sleep and then i guess i woke up, but when i got up i couldnt get out of my bed in any direction (my bed at that time was the bottem bed of a bunk bed one side was against the wall there was only 1 exposed side that i could possibly get off) ok well after trying to get out for a bit (the place i was in was completely dark) i found that there was tiny spaces in the foot of the bed. I could barely fit threw(they always exist and i felt them as i was searching for a way out but its very hard to fit out of them so i didnt think of trying till i was desperate to get out) so managed to get out. Then I walked downstaires and checked out my presants(didnt even turn my light on and check my bed or anything like that at all). Then i walked back upstaires and went in my bed AT THE NORMAL ENTERANCE of my bed and there was nothing at all obstructing it. i think i said somthing like “weird” and went to sleep and then woke up in the morning and remembered this very clearly. So was i having a lucid dream but not really realize i was dreaming or somthing like that? (the only thing i dont really remember was what the preasant’s where like, size, shape, place, color or anything, but this happend a few years ago so i probly shouldnt remember everything)
Nah, it isnt a LD unless you really realize that you are dreaming.
But sounds like you was close.
Oh, that was some magic that Santa Claus 
used to keep you in bed so you wouldn’t see him, but you almost found a loophole in time! 