Some other experiences seem to overlap partly with NDEs. Out-of-body experiences, one potential element of a NDE, can also occur in circumstances in which death is not imminent—such as while a person is under anesthesia. Comparisons have been made between NDEs and experiences people have while on certain kinds of hallucinogenic drugs. Events that may prompt NDE-like phenomena also include fever, fainting, injury, and other physiological disruptions.