Hi,
My name is Mariana, and I own a Web Portal and online community on Lucid Dreaming in Spanish: www.suenoslucidos.com.ar.

From my own experience, and the experiences of some users of my website, I come to the conclussion that there are, at least, bassically two types of WILD's:

WILDs type one:

You relax and concentrate in keeping your mind awake, while your body is getting asleep. When hypnagogic images arrives, you HOLD them, and try to get them sharper, and each time more vivid, until they become the images of a dream. This type of wild takes FEW time, perhaps some 15 - 40 minutes. I suppose that REM fase is accelerated with this exercise. You get to it in an ACTIVE way, generating your own dream scenario, by intencificating the hypnagogic images. There are NO vibrations. Dreams obtained with this method are very lucid and long, you have strog dream control on them.

WILDs type two:

You relax and concentrate in keeping your mind awake, while your body is getting asleep. When hypnagogic images arrives, you LET THEM GO AWAY, and keep your mind focused in your body relaxation and breathing. This type of wild takes MORE time, perhaps some 60 to 90 minutes. You get to it in an PASSIVE way, being the first dream scenario usually your own bedroom. There are vibrations and some times dream paralysis. Dreams obtained with this method are very lucid and shorter, you have weaker dream control on them.
You experience several false awakenings with this technique.

Do you, dreamers of this comunity, know more about this two kinds of WILDs?

Can you advice us of a book or webpage where we can read more about the scientific basis of these two methods?

Do you know of other clasifications of WILDs?

Thank you very much in advance for your answers.
I know that here, in English, you have lost of resources and big communities with huge experience on lucid dreams!