My Cats Sensing Something And Weird Sounds

this happened around 3am in the morning. my cats seemed like they could sense something and the younger one looked to be freaked out. they were both fixated on this window for some reason. they also wouldnt leave the top of the bookshelf when i called them. the first sound seemed to be a moaning type of sound and there was also some crackling sound like something was moving. the second clip sounded almost like a faint chuckle along with that crackling sound. I started having a bad feeling so I went into my room after this.
sound has been turned up a little so that the moaning and chuckling sound can be heard.