I watched a movie.It was naptime in the afternoon for a young child.
I heard her brother said nighty night. I think we can say it only at night.
Can we say it at naptime?
And what should we say to children before naptime?
Learn English – When can we say nighty night
word-usage
Best Answer
Note that "nighty night" is something that you normally only say to a small child. If you said "nighty night" to your boss as you were leaving work this would be considered very strange, regardless of the time of day.
That said, it makes most sense when the child is going to bed for the night. People do often use it when a child is taking a nap, even if that's in the middle of the day.