Girlfriends guy friend messaging near midnight should I be concerned?

Anonymous
This is a quick one, gfs guy friend she hasn't spoken to in ages, is messaging girlfriend at almost midnight when he is either bored and most likely sat in bed. She messaged this morning and he said one word and that was it... does this sound strange? Should I take this as a red flag about the guy?
Girlfriends guy friend messaging near midnight should I be concerned?
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