I'm really tired so I hope this makes sense.
As you all may have guessed , I'm something of an insomniac and I discovered this while trying to get to sleep.
This is my process:
I try to lie down and be comfortable with the position I land in. If I'm not, I start over.
Once comfortable, I wait for my breathing and heart rate to slow (and will them to do so).
Then, I close my eyes and try to concentrate on only feeling the farther extremities of my body(finger/toes). I concentrate on the sensations there( cool,warm, maybe an itch).
If there is an itch, I try to use my mind to eliminate the sensation (this can work if you don't try too hard, otherwise you can start itching all over). If I fail, I back up at least one step.
At this point (barring itches) I really only feel the tips of my fingers and toes, so I begin the next step.
I then try to move my points of concentration slowly away from my extremities leaving each area of my body shut down sensationwise as I pass it.
Eventually, I have done this for my whole body and remain very,very still.
Remember, the eyes have been closed this entire time.
At this point, I begin to look at what there is too "see" with my closed eyes. Generally, this will be the illusion of color and motion.
The next step is to "look around" without moving my eyes. In other words, I will move my perception rather than the eyes themselves.
I have always refered to what I am seeing as "purple dust clouds" which are constantly swirling and shifting.
Watching these clouds is my method of not thinking about anything at all, which is very hard to do if you are trying.
If I've done all of this just right, the next thing I know it's morning.
Hope this helps and doesn't seem too strange.