Audio event of unknown origin.January 11, 2015. Today started with a NOISE.At about 5:13 this morning, I woke up...and I heard it right away.A deep, droning sound...more than just a HUM...and with a “mechanical” quality to it.I listened to it for a couple minutes, then got up to go to the bathroom...giggled to myself, thinking I was just hearing my bladder rumble.No, that wasn't it...I could hear it in the bathroom...And all throughout the house !! After leaving the loo, I went into every room, and looked out the windows, and UP.But the sky was very overcast, and I couldn't see anything.As much as I wanted to go outside and look, there was “something” that told me not to do so...this morning was not a cool time to do so...and I have to admit, the sound was a bit eerie.The most intense aspect of it was NOT just the noise itself...but HOW it seemed to be...The best way I can described it would be that it seemed to “encapsulate” our house...as if a bowl had been put over us, upside down.And yes, to me, this noise was LOUD...quite a bit louder than the HUM I regularly hear when I really listen.So I went back to bed, and lay still and listened.All the while this was happening, the cats were glued to me.Not freaking out and running around the house, but trying to stay as close to me as they could.And when I came back to bed, and lay on my right side, 3 of them lay on the top of my left side...3 more lay right next to me as close as they could get...and several more were on the dressers After about 45 minutes more, it stopped...as if someone had flipped a switch.It didn't “fade away”...it was just suddenly GONE.The silence was very intense...made the hairs on my arms and neck stand on end...Several of the cats came slowly over to the bedroom window to look out...and yes, they looked UP.And for the life of me, I could NOT get back to sleep.My husband, ((name deleted)), woke up to go to the bathroom around 8AM, and I asked him if he had any weird dreams or such...he said NO, but felt that the house was creepily quiet.And no, I did NOT wake him up during the NOISE...I had wanted to, but couldn't figure out HOW to do so without planting the suggestion of “hearing something weird” in his head...THAT would have affected his experience.So now I must investigate this, to see if anyone has reported such an experience to MUFON and NUFORC.Everything I learn, I will write down, for my own records.((NUFORC Note: If anyone in the Orlando area was witness to the sound, we would like to invite them to submit a written report, to supplement the report above. PD))