Sincere question: do we have a good definition of consciousness to be able to say there are different ones? May be experience might be the right word ?
"Altered state of consciousness" is a well-defined term in neuroscience; there's an inventory you can use to assess if a person is in an ASOC (actually three competing inventories, IIRC, though that may have settled down since I left grad school back in the Pleistocene).