in his head
Ich möchte nur mal nachsehen, was so in seinem Kopf vor sich geht.
I just want to see what’s going on in his head.
— Five Nights at Freddy's 2 (2025)
Also musste er das Verbrechen auslöschen, zumindest in seinem Kopf.
So he had to erase the crime, at least in his mind.
— Psycho (1960)
Da muss etwas in seinem Kopf nicht stimmen.
There must be something wrong in his head.
— Amarcord (1973)
Er ist gestorben, weil die Knochen in seinem Kopf zerbrochen sind.
He died because the bones in his head broke.
— Die Frau im Nebel (2022)