in one's sleep
Tom a dit que Mary était morte dans son sommeil.
Tom said Mary died in her sleep.
Elle est morte dans son sommeil, paisiblement.
She died peacefully in her sleep.
Tom parla dans son sommeil.
Tom talked in his sleep.
Il s'est allongé et ils l'ont tué dans son sommeil.
He lay down, and they killed him in his sleep.
— Dans ses yeux (2009)
Sauf qu'après tu l'entends crier dans son sommeil.
Except then you hear him screaming in his sleep.
— Requiem pour un massacre (1985)
Elle est morte paisiblement dans son sommeil.
She died peacefully in her sleep.
She talks in her sleep.
He died in his sleep.