Why and how do they occur? I get one every few days usually, and they creep the hell out of me.

Is it simply the brain misinterpreting the present as the past? Or is it something more?

It happens when you see something and your brain tries to interpret it is 'just seen', but it accidentily goes to memory. Then the brain is like "Hey, I know that". and then you get the idea you saw it before.

Very good thread, nearly had me for a second there

You're brain keeps nearly every new piece of information it see's. Sometimes when you have done/see something you have once done in the last few days. You're brain automatically see's it and recognizes. It happens so fast, you get Deja vu.

Or it's because you have a future self of you running around doing things a few days ahead of you.

:v

And as far as I know it occurs mostly if you get too less sleep, because the brain is more likelyx to make a misstake then. (At least for me, it is true )

Not really...That'll be not deja vu if you have less sleep

Ok, you're right there, i googled it and deja vu and tiredness are indeed not connected. Sorry, for the misinformation

I am myself suffering from less sleep...because of various reasons...So I know it myself...

Head goes void when you less sleep...Deja vu aint what you get then...

I get dщjр vu every now and then.
It freaks the shit out of me.

every dщjр vu i get, its always about something bad T_T