This sounds like you were trying to WILD without any prior sleep. That is not recommended as its possible only in some rare occasions. Like when you are sleep deprived for certain amount of time or have certain medical condition that takes you straight to REM.
And unless you have a medical condition that puts you in sleep paralysis when you are not in REM, you will not notice SP. SP starts only AFTER you start dreaming. By then you are already asleep and either having a non-lucid dream, or you are WILDing and having a lucid dream. In both cases you don't notice the SP.
SP is condition our body starts to immobilize us when we are dreaming, so we don't hurt ourselves. It's when we can't move at all, no matter how hard we try. It's not when it's really hard to move because our body is so relaxed and we don't really want or care to move.
When our body is falling asleep it comes with all kinds of weird sensation. We normally don't notice them because our mind is falling asleep almost at the same time as body does. But when we WILD, our mind stays aware and we notice them.
They can be tactile, auditory, sensory or visual. We can feel, see, hear things like vibrations, body getting lighter/heavier, all kinds of tingling, relaxation sensation, falling down, sinking through bed, hearing all kinds of different sounds, seeing images or even movies. These can also happen when we are in SP because we are in REM and dreaming, but they don't happen because we are in SP. They happen because body is falling asleep. The only indicator of SP - sleep paralysis - is when we can't move no matter what.
The confusion started years ago before any good information from Lucid dreamers was available. When all "scary stuff" happening while falling asleep was thrown into one bag and labeled SP.
But now we know better as you can see in these 2 threads put together by our members with decades of experience in lucid dreaming and sleeping (haha).
http://www.dreamviews.com/wake-initi...explained.html
http://www.dreamviews.com/wake-initi...mystified.html
To all the good folks that are replying to questions on this forum - I thank you. I would like to invite you, the new generation of lucid dreamers and helpers on this forum to helps us dispel the myth of SP. 
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