C.H.
My daughter had hallucinations after using a medication. he saw jumping soiders all over her bedroom.
I stopped the medication and let her sleep in the living room.
If any of the medication is new or has recently increased, I would stop it(if new, and go back to old meds) or decrease it if it was recently increased, just until you can reach the doctor. Or you can always just keep the cereal out of view, but if it is medication related he may just have different hallucinations. Good luck.
P.S. Never stop a long standing perscription without medical advise.
Carrie