I firmly believe that there's more to it than body position or occlusion of the subclavian. I have this same issue while on a cycle but it quickly resolves after I stop the AS. I just can't figure out the mechanism. I'm currently leaning towards the possiblity that the normal atonia associated with REM sleep that occurs at the neural synapse may be esqued and transfered to the mylinated nerves of the cervical spine. This would indeed cause the feeling of paralysis in the upper extremities and resolve very quickly upon awakening, which is exactly the symptoms I suffer. The supraphysiological levels of blood Testosterone that occur during an AS cycle may extend the chemical response to atonia in the brain and allow leakage of the normal barrier to ancillary regions. Or....it could be my neck is just too fuckin big! 

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