Saying goodnight?

I have been texting this girl I like lately and we will talk for around an hour or two every night or every other night and at the end of it one of us has to go to sleep or is getting tired so we will say something like "night =)" or just "good night" but a few nights a go. She started saying night sweet dreams and started getting more creative.

I asked her out before and she wanted to be single for a while but she still liked me (I think) now I don't know. Am I reading into this too much or does the way she says good night show something?

Saying goodnight?
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