Could be. Both my youngest sister & my daughter have weird falling asleep hallucinations. In fact, I freaked out when my daughter told me she sees multi-colored flowers floating around many times before she falls asleep whether her eyes are open or closed. And I remember, I had just taken her to the eye doctor less than a week ago, things were OK, just a bit more myopia (not a huge surprise as I have it & it runs through my family). I was like OMG?! Why didn't she say anything to the doctor? I'd even asked the eye doctor if she had any floaters because I got them at a very young age, 6 or 7. The optometrist is able to see the floaters, and he'd said no, not that he'd noticed.

I looked around all online, some people were thinking stuff like that was ocular migraines, but for the fact hers only happened before falling asleep. Many people on the internet did have this experience; lots of testing, nothing wrong. I probably would have gone on to insist on testing, but then, I was talking to my youngest sister who told me, oh, yeah, she sees floating flowers (mostly pink) before falling asleep most nights and has since she was a child. She has no mental health problems, no issues at all really, beyond bad PMS.

So apparently sometimes these sleep hallucinations aren't even necessarily related to mental illness. I sometimes have the auditory hallucinations before sleep, birds singing of all things.