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I was watching my Anusara Teacher Training DVD's with John Friend and this topic came up! John said that he gets asked this question a lot. He said no he doesn't recommend a certain mattress or pillow (darn that would have been to easy). He said that when we get misaligned during our sleep that is a result of some misalignment's that happen during the day. He said these misalignment's should be addressed during the day, and at night JUST SLEEP. This is not the answer I wanted to hear. During the day I work my alignment but still at night I toss and turn and wake up with some kinks and soreness.
I did a practice with my teacher Adam Ballenger last Saturday and he talked about how hatha yoga is two parts. It includes the action, one definition of hatha is to strike. He also talked about how the "tha" in hatha means a receptivity, a pause where you see your results of your action. I have heard Adam teach something similar to this in a public class relating it to car singles. You car will let you know when the engine needs to be worked on, or when you are low on gas.. But we have to "tha" we have to listen to that information.
So this gives me an opportunity to practice the "tha". The results, misalignment while sleeping tells me that I need to change what I am doing during the day. Although I was hoping John would give an answer like ____ pillow and you sleep perfectly. But now I just have another way to "tha" to notice the effects of my practice.