AOT question about Eren dream

[MyNameIsHammurabi]

In episode 1 of the anime Eren sleeping under the tree had a dream of what was about to happen. Was that Eren or Ymir sending memories? Or was that just a dream he himself just had.

 

[Renko]

its time fuckery. falco had something like that before becoming a titan shifter too

im not investing into anything involving time fuckery again

 

[Looksmax Refugee]

I think nobody understood that so good question