When I’m dreaming, usually regular dreams, sometimes in LDs, I often feel physically hindered in some way. I may be unable to see clearly, unable to talk loud, or I walk slowly, like I’m walking in molassas even when I try to run. It’s very frustrating. Does anyone else experience it? Are there ways to prevent it? 
Wouldn’t these make for easy dream signs to detect? Like everytime you feel hindered in some manner, just do an RC.
I know what you mean, in a lucid dream I would imagine that means its very low level. In a ND maybe it is your SC telling you something. Look more closely to the situation and maybe you can figure it out yourself. 
I often have a dream where people purposefully make me angry, but when I punch it feels like 1000 pillows obstruct my path to his face. I hope I helped in any way.
It could also be that the LD is due to end. I sometimes havetrouble with moving my legs when a dream is due to end. 
I have that a lot too, most of the times in ND. I’d say that it is just SP that you feel a little through the dream…
This has happened to me in one case, during a LD. 
In this case, I had attempted to shout out commands, but I was unable to speak. Although moogle had said that it means it is about to end, that isn’t always the case. In my case, the lucid dream still lasted for some time afterwards. 
I don’t recall this ever happening to me in a ND, though.
This used to happen to me all the time in ND’s, still happens once in a while. Usually it’s when I’m running away from someone in the dream, and I can’t move my legs normally… it’s like running in slow motion. And the more I fight it, the slower it gets! I would start jumping instead of running then, but even the jumping was in slow motion. 
Maybe it has something to do with stress levels… or feeling “limited” IRL maybe… because it only happens to me in stressful dreams, when I’m being chased.
Never had it happen to me in an LD though.
I take that comment back - I do remember a time when this has happened to me in a normal dream. In this case, I had the inability to walk quickly, either because of the shoes I was wearing, or that the floor was slippery. Either way, I had bad traction, so my best bet was to get around by hopping.
In my experience, when I start to not be able to see clearly or to move, it means I’m too mentally tense. I do my best to calm down, and often this solves the problem. Sometimes, too, as other people mentioned, it means I’m about to wake up if I don’t do something to intervene and stay asleep.
I think it’s quite a common dream sign. I get this all the time (particularly in LDs…), and my Dad does as well. He has a dream that, while playing football, there’s a ball in the goal square with no one around it and so he tries to run toward it, but can’t. 
At any rate, I believe it’s quite common. Don’t worry about it (unless you want to use it for RCs, of course).
Thanks for all the comments. 
I guess I could try to use it as a dreamsign, but I’ve never been very good at recognizing dreamsigns. Oh well, it’s worth a shot.
Seeuzin is right, you just have to let it all go. Don’t get very excited or tense…Just acknowledge you’re situation and calmly control it. It stabilizes the dream alot…
I like Seeuzins idea. I just had an Ld last night in which i could not move at all. It took so much strentgth to move my hands to eye level to do a RC. I couldn;t even shout increase lucidity. I just lay htere in my bed very angry that i couldnt do anything in my lucid dream. Next time i’ll try to relax. That might work. Thanx alot.
I hate when I’m unable to move. I had a LD where I was a bat and then I got stuck in the air! I couldn’t even move my head! All I saw was one fixed image. My LD’s have a tendency of being long so I was stuck like that for quite some time suspended in the air.
This tends to happen when my eyes are partly open when I’m sleeping. I see part of my bed and in the dream I see something that looks like the shape of my bed like a mountain.
I’ve experienced this before in NDs…one time maybe two years ago or so, I was having a nightmare, something scared me so much that I tried to talk, to call my boyfriend for help, and no sound came out of my mouth, it’s like I was paralyzed. I’m pretty sure I couldn’t move my body either. It was so terrifying that I woke up calling out to my boyfriend. I don’t have nightmares like that any more since I started learning more about dreams. In fact, I rarely have bad dreams at all and when I do they don’t scare me like they used to…I don’t think I’ve had the in-dream paralysis effect since then either.
I’ve had one or two dreams where I started getting blurry vision halfway through, which ruined the dream because I spent the rest of it searching for my contact lenses which I’d subsequently assumed I’d lost!
I’ve also had two where I was totally blind, but these weren’t actually too bad because all my other senses were working normally. In one, my vision came back again eventually once I discovered “the cure”, and in the other I was quite happy being blind. Very interesting dream, actually.
The only time I’ve ever lost my voice was in a lucid dream and it DID almost end at that point, but I managed to hang onto it for another five-ten minutes or so. I’ve also had a raspy voice in a dream, but this turned out to be integral to the plot and fixed itself it due course.
Movement for me has never been restricted. If anything, it’s greatly increased! I usually run and swim much faster, jump higher, fly everywhere and crawl under impossibly small holes! (Which is just as well, since travelling and exploring is probably THE major thing I do in dreams!) My dreams like to be more sneaky, however, and I’ve had certain dreams that do everything they possibly can to throw up not-so-obvious obstacles (like obnoxious characters or ethical dilemmas) in my path to prevent me from reaching my goal anyway.