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