A couple years ago I had moved out of my parents' house to go to college, but I still came home on the weekends to visit them and would usually stay over night. At the time, my old room was being used for storage so I was sleeping on a lovely little bed made of about 14 blankets on the floor with my head right up against one of the heater vents in the midst of all the boxes they kept in there. I had lived in that house for 16 years prior and had only one unusual thing ever happen to me while I was there, but I just shrugged it off as a lucid dream.
Once I started going back to visit them I noticed my cell phone would rapidly lose battery life over night (go from 70% to 12%). Of course at first my thought was that my phone was going to crap and that I'd need to get a new one, but sure enough I noticed it would ONLY happen when I spent the night there. It didn't happen at my apartment, not once and it only happened at my parent's place and only overnight. It was definitely starting to get weird. Then, one night I was staying over night to a Monday so I knew my parents and my sister would be getting up early and getting ready for school and work the next day. I woke up and it was still dark out so I figured it was still decently early in the morning, but I could hear female voices talking downstairs in our basement, which is all gross with creepy-crawlies and we only go down there to do our laundry, and thought that it was odd that both my mother and my sister would need to be downstairs to do their laundry that early in the morning but just went back to sleep.
Once I awoke for the day I asked my mom why her and my sister were both doing laundry so early and she told me that neither of them were down there. I insisted that I heard two women talking coming from the basement through the heat register by my head, but she assured me no one was in the basement.
Slightly shook from her response I messaged my father, a huge believer in the extraterrestrial and all that. I told him I heard people talking downstairs during the night and that mom had told me no one was down there at all and his immediate response was, "Were they women's voices?" Now slightly more shook I told him yes and all he said back was, "You hear them too?"
Later that evening he and I talked and he told me that sometimes on nights that he stays up later he can hear what sounds like two women talking through the heating vent in his bathroom and that was how he knew to ask if they were female voices, he had been hearing them too.