Into the night and fog in German is In die Nacht und in den Nebel hinein
Nacht is the German word for night.
nacht
You say "Gute Nacht".
fog = Nebel fog = Schleier (figurative)
English: "good night" is German: "Gute Nacht".
Fog translates as (der) Nebel.
Spielnacht or Spiel Nacht
"What are you doing this Friday night?" = "Was machst du Freitagabend?"
The type of fog that forms in valleys at night is Radiation Fog. It usually does not last long after sunrise.
"Gute Nacht" is the usual term.
die Nacht der Toten
Nebelstein.