Out of body experience
Some people think OBEs are just dreams, but other people say OBEs don't feel like that.  Some people think that when others have an OBE, they're like a ghost and the things they see are real.  People who think that sometimes call them 'astral projections'.  Some scientists like Sam Parnia are doing tests with hidden pictures in hospitals, to see if ill people really can see them when they have NDEs.