My aunt used to gasp, when shocked about something, "Nay good night!"
I didn't understand as a child, but I have a feeling now, it means (roughly) not getting a good night's sleep over the shock or concern.
Does anyone else have an insight? Or an old Aunt that used to say this?
For reference: She was born in 1920 in North Dakota. This was the first generation of her Norwegian family to be native English speakers.