I just want to share my experiences with you (hope you got the patience):
i first had this experience when I was a kid. I was very afraid then. Then I sleep paralysis so many times afterwards nowadays when it happens I just think "damn it happened again, now lets check body's position which muscle I can move" etc. Just one year ago I was having several times a week but these days i'm having it in a month or so. So I can easily say that I had this experience over a hundred times.
First things first I read on the net that some people are smelling ,hearing things or even feeling someone or something is in their room. Luckly none of those happens to me. When it happens to me, I am very very aware of my surroundings. I feel ,hear ,smell everthing that is in the real world,nothing mystical and I don't feel a weight on my stomach .I felt suffocating few times and that was first time and the times between I got used to it.
It usually happens to me in the morning when i'm fully rested. I hear and smell everything in the real world like my girlfriends breathing in her sleep.
When this exp. Happens for nearly 1/3 of the times I feel sleepy (happens in the middle hour of night)if I let it to my consciousness I would fall back to sleep. But I do not. For some reason maybe because of the feeling of going somewhere unknown and dark I always want to get up. Want to awake myself.When I do I just stay awake for a 5 min or so then sleep again.And for the other 2/3 it is usually in morning where I already got my sleep . But my body seems to be lazier than my brain or consciousness:) when sleepy it is very hard to stay awake and wake up, like just like you feel very sleepy and lying down on the bed without moving. How one can stay awake?
But middle of night or in the morning I always force myself to wake up and wake up too. First I check my body's position and I pray that i'm not in a position which makes one of my limb numb (like you sleep on your arm and after a couple of hours it goes numb) because it is very very disturbing to feel your arm numb and itching and you can't do something about it.
There practically one thing I can do after that. And that is moving rapidly one of my muscle. I can move just two of my muscles on my entire body. And one of those are (even now I wonder why these two muscle) on the face which forms cheeks when you move(sorry I don't know the scientific name) and the other is my foot ,but just from the ankle .I really tried to move my arms legs very very hard a lot time but they do not move. Just a very few times they seem to move just a very little but when I wake up I see they in the same position when I first gained consciousness. So moving these two muscles (usually my feet comes first but if they are struck by the position of sleepthen the face muscle) I can awake a few times later.
Funny thing is I even instructed my girlfriend about it. When in night she wakes up by me moving my feet rapidly she quickly wakes me up by touching and calling my name. I thank her then we sleep again.
Just one time I really remember very clearly . It was midnight and I had sleep paralysis .As always I tried to force very hard to stay awake but for that one time I lost the battle. The last thing I remember was I felt my consciousness was like a liquid substance and was pouring through a hole to the darkness. When the last bit of it poured I was asleep.I remembered it very clearly in the morning.
After reading on the net i'm very relieved that there are so many like me. Most of the are having this experience in a different way. So people like me who have this experience should not worry or afraid. It may not be easy when you have it first time. You just need to get to normal breathing and calm yourself with the idea that this is a natural thing. And check to see which one of your muscle you can move .If you find one then move it rapidly. This should wake your body.
Also my experience is that tiring body with exercise seems to lessen it.
it is a survey about sleep paralysis .These people are collecting data on this subject. Even now thay say 7000 people participated
have a nice day and don't make this concern you.