What does Islam say about the phenomenon of déjà vu? What should a person do if that happens to him?

Praise
be to Allah

Déjà vu is a French phrase meaning already seen. It refers to
a person feeling that he has lived or seen before the situation he is
currently experiencing.

Neurologists and psychologists differ concerning the
explanation of this phenomenon.

Some them attribute it to an anomaly in the memory, having to
do with connections between the nerves that are responsible for short-term
memory and long-term memory.

Some of them attribute it to feelings or emotions being
experienced in the present, that bring to mind details of some past events,
which makes us feel that we have lived the present event before.

Some of them attribute it to information that we learned
before, but we forgot it, then the brain retrieved it, so we imagine that we
lived through the event twice.

However, many followers of certain religious beliefs or
parapsychological schools of thought attribute the phenomenon of déjà vu to
supernatural forces, or parapsychological interpretations, explaining it on
the basis of ideas such as telepathy or hypnosis, or attributing it to
ghosts or poltergeists, or other speculative interpretations for which there
is no evidence.

You should understand that there is no Islamic explanation
for this phenomenon, and it is not discussed in the Qur’an or Sunnah, or by
any of the scholars of Islam, and it has no connection to any of the
fundamental or basic teachings of Islam.

Regarding this matter, there is nothing except hypothesis or
observation in the realms of experimental neurology, or speculation and
claims made by followers of innovated or polytheistic religious beliefs that
have nothing to do with Islam.

If this happens to you, all you have to do is reflect on the
great blessing that Allah has bestowed upon you by maintaining your memory
and keeping it free from troubles and ailments, and protecting your mind
from mental illness and harm. How confused have the scientists been, and how
much have they argued and differed concerning the interpretation of this
phenomenon, yet despite that they have not reached any definitive conclusion
about it!

This is indicative of man’s great ignorance of many things,
and his inability to explain many of the secrets of the brain and other
faculties. For more information, please see the following books:

The Déjà Vu Experience,
by Alan Brown

The Déjà Vu Enigma,
by Marie Jones

And Allah knows best.