De Jar Vous
is easily explianed
by me

de ja vous is basically a trick on ones mind

it is Basically an unconscious double take

caused by something deeply impressive or shocking or it can also manifest in a day dreaming state

thse two distractive phenom a deeply impressive visual event or a day dreaming auditory event
cause the brain to be occupied
and so the person only consciously recieves the awareness of the event
AFTER THE FACT
and so gets a uncotrollable esne and feeling the event has happened before
when it only happned seconds ago
this occures
because whatever it is that has shocked or awaed or impressed upon the person visually or auditory
short circuits the normal brain function of time awareness
and causes a subconscious then conscious awareness of location place sound or sight
the phenom therefore causes a complete lack of event time recongnition both visually auditory and sense of being consciously present in the physical
so it causes what ids reffered to as DE JAR VOUS