I am not quite sure, what is meant by "de-realization".
Some of the things, I experience are due to slightly delayed sensory synchronisation. Others has to do with the proprieceptive sense. The latter and out-of-body have mainly occurred in periods with bodywork or body-therapy (provoked by fear, perhaps) or during intense musical work.
Someone mentioned :"Looking at the world from inside a cave", like not really being there. Is that a depersonalisation? Even if I don´t feel empty? I am there, but I can´t come out (mostly in connection with real depressions).
During a reasonably strong anxiety the other day, I saw my hands doing things like a in silent movie and the sounds were disconnected like if they came from a soundtrack from another movie. Very strange.
That must have been a sort of de-realisation too.
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Femaline
Special Interest: Beethoven