a random thing that happened when I was awake in the middle of the night yesterday

so what happened was I was laying in my bed I usually it takes me a while to go to sleep but this time I COULDN"T fall asleep either that my paranoia is really bad or that I hallucinate when I can't sleep for some no God damn reason I kept hearing a very quiet voice say "k1ll" which was disturbing cause it came from inside cause I live upstairs and it sounded like it was coming from the hallway that connected to the stairs and when I got up to go see what it was there was nothing .. so I went back to my room and yet again the same voice say " k1ll " came back one thing I also notice was the tone it was raspy and dry (this started happened around 4;00 am then stop at 5:30) so for the rest of the night or morning I was confused and scared till finally I fell asleep (more like passed out) so yup that's what happened