Does anybody know what this is/what I should do at this point?

I can do this like if I want to by lying in bed and letting my mind wander but while still being concious....I'll start to have this weird image in my mind of something, like if I was day dreaming about something, it would be the same thing but it would just be this extremely odd, mutilated, distorted image of what I was thinking of.

Not to mention the feeling of falling down through an endless tunnel while shaking wildly as if high voltages are flying through my body. Is this me entering SP? I've done this a few times and it happens when I'm on my back or on my side.

I think this is me entering a WILD because I accidently WILD'ed about a month ago and I felt the same thing at the point where I entered the dream. Usually it lasts for maybe 30 seconds to a minute and then it just fades away and I come back to reality...no visual hallucinations or anything, except, up until I move, I can't really feel my body at the points at which my body is touching the bed, like at all.

What the heck is this and can I use it to enter a dream?