How do I make sure an adult is at the other end of the phone, in the middle of the night?

I'm a middle school teacher. A student recently reached out to me last week via Google Voice, around 11pm. I immediately shut it down and let them know I was deleting the text. <br><br>A week later, I received another text from the same student in the middle of the night. I again shut it down and communicated that I was deleting it. <br><br>At this point, I want a plan to communicate to them, via email or Google Classroom, on what protocol I want them to follow in the event of an emergency. I want to make them understand that I won't be communicating with them outside of school hours, but also want them to have a protocol in place to communicate with a trusted adult in the event of an emergency. <br><br>I've seen similar posts, but am looking for specific guidance on this.<br><br>Thanks