I have had this one time when I was very little. Around 6 or 7 years old or so, but I remember it very clearly. For me, it was like a gunshot went off right next to my head only a couple minutes after I fell asleep. I remember jolting awake and asking my brother and mother what it was, but they had no idea what I was talking about. Maybe some people have different experiences, but mine couldn’t be mistaken for a UFO sound.

Yeah this is not an unpopular opinion, especially on a site like this.