Hallucinating

I’m 6 months pp, and still hallucinating. Right after I gave birth, sleep deprivation was real, and I would hallucinate. Mostly normal things like thinking I had the baby in bed with me when I didn’t.

I’ve caught up on sleep, as my baby now sleeps through the night, but I’m still seeing a ghost cat, and today I heard a whistling noise when there was nobody there.

Is this normal? Does it go away?