Yeah, it's the thing with the REM periods. If you arent in one, you can't enter a dream. Because the dream is there in the REM periods. So there's nothing to 'jump' into. You should combine it with a WBTB (Wake back to bed) meaning you go to sleep, sleep for a few hours (I think it's 5-6 hours that's suggested.) then get up, and stay up for 10 - 60min and go back to sleep and attempt the WILD. Hopefully, you should be able to see and hop into the 3d picture.

Note that I've still not had my first lucid, let alone a successful WILD! But good luck to you! Keep trying, it will work!