Why Would She Text Me At 4AM?

i wake up at 4 am to a text message. It's my girl/friend saying "good night *blushing cute face emoji* ". I ask her the next day and she said "don't judge me ok? I woke up at 4 am checked my phone for the time, and texted you. Why did she text ME and not her Best friends? Or just someone else?
Why Would She Text Me At 4AM?
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