Top Definition
Any substance with Oneirogenic effects; producing twilight sleep, hypnogaugia, lucid dreaming, intense visions, or euphoria during repose, but which have little or no effect on an alert wakeful consciousness.
"That stuff I ordered online didn't do much for me until I fell asleep-- and man was it ever sleepadelic!"
by Coz the Shroom October 16, 2011

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