My sister was sick I thought I may get to her house up in the mountains and have to take her to the hospital. It was around 9:30 pm that I got there I assessed how she was and made her a cup of tea and soup. As I handed it to her I heard a noise it's about 10:00 or almost 10:30 pm. I asked her do you hear that noise so she stopped eating then I said is it the water pipes or the hot water heater it was a warm nite so no heat was on. She said no she had never heard that sound befor I asked her do you hear it behind me pointing to the back of the house. She was pointing to the front of the house then it got louder I am an electrical tech I have worked with a lot of electrical sounding machines I have worked on trains planes autos this was an electrical undulating sound. After my sister said it was in the front it got louder I looked at her and said no and I pointed above us. I told her its above us she wanted me to go outside to look but I am like I am not getting beamed up so I didn't move then dead silence. Still to this day I tell my sister I was glad she was sick maybe that's why they didn't bother with us. This sound I will never forget I know electrical sounds but that wasn't anything I ever heard I have to say that after that I didn't spend the night too many times after that. My sister and I don't live there any longer she is in Arizona and I am in California not because of that nite but we are both in towns with people and street lights not like back home.