If a woman says 'sweet dreams' to a guy could this be considered flirting?

If you've been IMing a woman and for most of the chat there was some serious flirting going on, could it be considered flirty if she signs off the chat by saying "goodnight, sweet dreams"?

We are both single by the way.
Yes
No
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If a woman says 'sweet dreams' to a guy could this be considered flirting?
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