Guys why would a guy text a girl goodnight out of the blue? At 10pm?

Anonymous
This guy I saw in the morning and had a quick conversation with him, we're not dating!
And about 10 hours later at 10pm he text me a compliment with a goodnight at the end of the text!
I'm not stupid he was obviously thinking about me but my question is does that mean his interested in me and his sending out signals that he likes me or was he just thinking about me in a dirty kind of way?
Guys why would a guy text a girl goodnight out of the blue? At 10pm?
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