Dream or Astral Projection

Dream [merriam-webster.com/dictionary/dream]
: a series of thoughts, visions, or feelings that happen during sleep
: an idea or vision that is created in your imagination and that is not real

Astral Projection [en.m.wikipedia.org/wiki/Astral_projection]
:Astral projection (or astral travel) is an interpretation of out-of-body experience (OBE) that assumes the existence of an "astral body" separate from the physical body and capable of travelling outside it.