Seth Rogen's Wife -- I Have an Unstable, Delusional Stalker

Seth Rogen's wife says she's in constant fear of an "unstable" delusional stalker who claims he follows the orders of "voices" in his head ... this according to legal docs obtained by TMZ.

Lauren Miller -- who's also an actress -- has obtained a temporary restraining order against 31-year-old Yasin Ajani ... after claiming Ajani came to her home and tried to manipulate the family maid into letting him inside the couple's L.A. home.

According to legal docs obtained by TMZ, Miller claims Ajani knocked on her door at 6 pm on July 16 ... and told the maid he was a friend of Lauren and Seth ... and came by the house to deliver a package.

But the maid refused to let Ajani in the house, claiming he appeared "unstable" ... so Ajani proceeded to hop a fence and laid down on a couch in a private area in the couple's front yard.

According to the docs, police arrived to the home ... and arrested Ajani for criminal trespass.

Ajani allegedly told police ... "voices told me to go see and talk with Lauren."

Lauren says she is "fearful that Ajani will continue to stalk me and come to my residence to seek me out."

She adds, "I cannot sleep at night and constantly check through the windows and the surveillance system for Ajani."

According to the docs, Ajani has been placed on a 72 hour hold to evaluate his mental health.