oneiroid syndrome

A 2012 study by Renemane (neuroradiologist) et al. leads to conclusion that the NDE is considered as a state of unconsciousness resembling of oneiroid syndrome.

Later in 1961 the Bulgarian psychiatrist S.T. Stoyanov studied the dynamics and the course of the oneiroid syndrome in "periodic", or remittant schizophrenia (ICD-10).