Theirs this weird, Erie sound that seems like its coming from outside.?

Where do you live? Some old house will create that eerie sound some times through cracked floor, doors, windows, even our old refrigerator, AC and heater will create those eerie sound...especially when the situation is so so quiet and soundless....may be when everybody in the house/area are in deep sleep and only you are still awake, the earth, the universe, will sometime let you hear those strange and unearthy yet true sound..do not worry, it is very normal....This is what people called: the sound of the universe....so...try to listen carefully and take a not, the humming, the tone and the frequency...But..if you started to get those goose bumps...just run to the kitchen and take as much salt as you can, and throw those salt at the sound and see what will happen....do not worry...may be just some.."unbeing" try to tell you something...ok?