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Is it like a pulsating feeling that feels that it is coming from the stomach but feels more intense in the chest?
Its a nice rushy feeling.
Is that what you are talking about?
Or is ther something that just clicks and you have euphoric feeling long time after the click?

"You all know of the 'Dream Machine' as developed by Brion Gysin"

No I dont. Please describe it.

I have never encountered any material associating OBE with epilepsy.
There appears to be no correlation in either direction.

Epileptic seizures are accompanied by certain EEG profile, while OBEs are accompanied by brainwave states associated with trance/deep sleep. If there was any connection, it would be common knoweldege by now.