Déjà - vu is the eerie flavor that something has already fall out before . Some people have join this phenomenon topast lives , dreams , andmatrix glitchesbut science evoke the reality is , sadly , far more mundane : déjà - vu is simplya storage we have forgotten returning without us realizing it .

Déjà - rêvé , however , is much rarer and , so far ,   has only been found to occur during seizures in epilepsy patients . The word literally interpret to “ already stargaze ” and tie in to a recollection of an experience that occur during nap .

A squad of researchers examined chronicle of déjà - rêvé trigger off during electrical Einstein stimulation ( EBS ) from 23 issue studies and seven eccentric notes commemorate in epilepsy treatment databases . Their results have been published in the journalBrain Stimulation .

“ electric brain stimulus makes it potential to trap this phenomenon that is almost unsufferable to immobilize in everyday life , ” Jonathan Curot , from Toulouse University Hospital , France , who conduct the written report ,   toldNew Scientist .

In aggregate , there come out to be three family of déjà - rêvé . The first , forebode “ occasional - like ” , come back a specific dream that come at a specific fourth dimension . As one patient described :

" Doctor : ‘ What did you palpate ? ’ Patient : ‘ Something that was in my dreams . [ … ] Well , really it was with a friend . We read a comic . [ … ] And in fact , it was a nightmare . And then after there is a expectant beetle coming . ’ Dr. : ‘ Was it a incubus you had long ago ? ’ Patient : ‘ Yes . [ … ] I was 3–4 years one-time . ’ "

The second is “ closeness - like ” . While the patient might not be able-bodied to recall the specific dream , they express a vague reminiscence .

“ Well , when I started to read , I had a feeling of déjà - rêvé . I do n’t know if I have dreamed about it last night . I cogitate of something I dreamed . And I had the feeling of reverence . [ … ] Well I see a graphic symbol and I thought I saw him in a dreaming . ”

The third and concluding is literally a “ moony state ” , during which the affected role feel like they are dreaming .

“ A singular feeling like passing out … I experience like I daydream it . Like something I had see … . Like I am float . ”

The first two family of déjà - rêvé look to have been induce by stimulation of the median temporal lobe , an area   of the brain involved in long - terminal figure memory , storage formation during sleep , and normal dreaming . The “ dreamy res publica ” was more diffuse and loosely occurred on the brain ’s lateral neopallium .

While the paper suggest that déjà - rêvé is a real phenomenon that can be triggered by a zap to the brain , it relies heavily on case studies . It would , therefore , be interesting to see if these results could be replicate in a controlled study .

“ It may be disputed that we can not be sure that déjà - rêvé ( occasional - same or familiarity - like ) are linked to true premature dream , ” the study authorsexplained .

“ EBS could simply produce a random compounding of optic and auditory elements , create surreal and unrealistic experiences similar to dream . ”