Wow, that’s quite a list you got there. I occasionally use WILD, though I prefer RCILD and MILD as they give slightly more stable dreams. Buuuut, here’s the answer to most of your questions.
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As far as the HI goes, here is a good guide for WILD. You might also check it for some answers to your other questions.
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It will make things very hard as you will have to lay still for a very, very long time. It will be much easier if instead of doing this when you first go to bed, you wake up about 5 hours after initially going to sleep. You will fall asleep much faster this way.
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It is the beginnings of SP, but its still not there yet. One little movement will break it, as will thinking about your body being numb.
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Sorry, I’m not the one to ask on that, but I’ve been told it does help.
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Counting my breaths as I exhale with deep, slow breaths.
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I do my WILD’s in the morning after I’ve slept for a while, so it only takes me about 5-10 minutes. If I do it at the beginning of the night, upwards of 45 minutes. Needless to say, I don’t do WILD’s when I go to bed.
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About 3-4 years before I was able to do the early morning WILD’s.
I really recommend you check out our Knowledge Base. It has great info on this and other techniques, such as this very helpful WILD FAQ.