12.27.15

Went to bed at 10pm and kept hearing this pulsating sound. Thought it might be from the TV downstairs, as GF and son were watching Transformers. But when they came to bed and the TV was off, I could still hear it. Sounds almost like car with a system bumping bass, but it just pulsates over and over. Reminds me a lot of the "hum" sound I would hear.