When I am trying to absorb a lot of new concepts that I am studying and trying to reason out(without luck), I find that I read them several times and then I go into a mental fatigue. Often, I will lay down and I pass into this mental state where I am not quite asleep and not quite awake. All sensory experiences are tuned out and I do nothing but work in a semi-dreamlike state on processing the concepts. This usually lasts for a couple of hours and when I "awake" I usually have any misunderstanding resolved, or at least a new way to go back and look at the material with a different approach. I wonder if this phenomenon is something like a meditation state. I've never been able to meditate succesfully by trying to make it happen, but I wonder if my brain is able to do this for me. Is this something that other students experience?