For me it's been mostly CEV's, but at stronger doses it's almost physically incapacitating. The ability to move about is there, but the will power required to do so is not, if that makes any sense. What might look a nap to the observer was, IME, the peak of the experience and I personally found it best to just lie still with my eyes closed and take the experience in as opening my eyes seemed to interfere or disconnect from 'the other'. My experiences were Rue based though which I've heard can intensify the mobility issues.
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