Although it's not exactly the outcome I would have liked at least I (mostly) understand it now. One of the reasons I answered a call from a strange number in the middle of the night in the first place was a few weeks before that my brother Aaron had called. He was at a friends house so the number showed up on call display. It turned out that he just dialed my number accidently but I recognized his voice, he appologized and that was that.
Yesterday Mom, Aaron, his girlfriend Carly and I went to Costco. While we were walking through the store I was telling Mom about these strange phone calls I keep getting. Aaron got a funny look on his face and asked what the number was. I whipped out my phone and scrolled through the "received calls" and read it to him. He rolled his eyes and said "That's Beau" (a friend of his). "Oh" I said, "well, please tell him that your sister can NOT help him get 'a twenty bag of bud'"
So, mystery solved. Hopefully that will be the end of my midnight calls.