I tried a SP technique (lie still in your bed etc etc.) and after some time, which felt like an hour, I lost the feeling of my body.. I continued for about 10 minutes but then I gave up because my feet started to feel restless.

When I moved my body, I wasn't frozen, only my arms and legs were little heavy. How long should I resist from moving?

Ps. I was lying on my back, and that's the position I cannot fall asleep.