One of the best pieces of advice I ever got with regards to WILD'ing; was to not focus on the fact you're WILD'ing. I used to lay perfectly still ignoring my body signals to move, but then start thinking to myself things like, "Hmm, I can see some faint images." or "I've been laying here for ages, I should be in SP now!". When you stop focusing on what's happening and just go with the flow, I find it's much eaiser to advance in the stages of the WILD.