This scenario happens in spits and spats, it isn't constant but it happens on a regular basis. To start with I do sleepwalk, and on occasions have hurt myself, once almost fatally from falling down stairs. Nowadays I lock my door with a key and put it somewhere else as I won't go and find the key while sleep walking.
When I was younger I used to suffer, on rare occasions, from what gets described as sleep paralysis. Couldn't move nor speak. As I have gotten older just of late, surprisingly after moving to a new place, that is an old place it has started happening again, but different. Now I am finding I wake and feel somewhat lucid and can hear noises and then I go to get out of bed, but struggle to move, like there is a weight upon me, like something holding me back. I can eventually get up out of bed and walk around the unit looking for the noise and see nothing, BUT, while I am walking I am struggling to move, it's strange it's like there is this weight down upon me, I eventually am able to say something and inevitably I shout out "F^%$ Off" and leave me alone, I think I say that because I feel there is someone else, maybe that's just what my brain perceives with me waking to a noise. I don't know if I am am being targeted by some being or if it is a sleep disorder of some sort but it is driving me nuts. Damn I am an analytical logical sort of guy, I am an IT guy, I don't believe in god nor spirits for that matter but this thing is getting to me. Just last night I had this again, and as I cursed I managed to switch the light on and heard what sounded like, I dunno, a gecko rapidly making a sound, damn eerie I tell you.
I don't tell people this of a norm in normal day to day life they probably wouldn't look at me the same way again.