Why do iphones randomly go off without displaying notifications?

I'm in a hotel with a friend and at 12:44 to night both her phone and mine lit up. I assumed that someone had sent something in a group message, but neither of us had any notifications on our phones. Not two minutes later it happened again and this time the phones vibrated. I don't have any clie as to why this happened and I'm curious to see if there's any explanation for this phenomenon. Any help would be greatly appreciated, thanks!

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