Taking SP further

m coming back into a phase of interest after a year long spell of not trying :).

Iv got great recall, remember at least 3/4 dreams every night, not needing to writee them down. (Would probably be more if i did :S)

I wake up after every single dream, so multiple times during the night, and i use these opportunities to try and WILD.

About half of the time though i reach some form of SP.

I get a rush of tingling sensations, feel light and my muscles are much heavier and harder to move than usual, (so not fully paralysed, but takes some force to bend a finger for example.)

I reach this point, then NOTHING, i dont get images in my mind, just complete blackness, and ill lay there sometimes for 20 minutes tingling, and no images will appear and i give up.

Is there anything i can do in this stage to induce further SP and get into my lucid? Am i doing something wrong?

Thanks :D