OK, mind if I ask a couple of questions about DEILD?

Well, I tried it this morning after waking from an LD, but it just didn't work. I remained completely still and tried to visualise the dream I'd woken from, but no picture came. I didn't try for very long (about half a minute I think); I couldn't keep still for any longer as I was lying in a bit of an awkward position. Would it have worked if I'd tried for a bit longer?

Could it be possible that my REM cycle had ended? Is there any way of telling when you've reached the end of a REM cycle?

Thanks for reading, any advice would be appreciated!