Originally Posted by
InnerVision
How long are these attempts? To me it seems that you are right in thinking that you haven't made it to sleep yet. Numbness of the body is often a signal of the early stages of the transition. Further in, you are likely to experience short hallucinations, dream fragments, sudden noises that do not really occur in the real world and things like that. They are not mandatory but very common.
To be a little more concrete I suggest you try to visualise an object like a door or your ceiling or something. If you're already good at visualisation you could even try to form full dreamscapes. This might help to initiate the transition, providing your subconscious with a starting point for constructing a dream.