Hallucinations can be pretty common behavior for those living with dementia. This also depends on the type of dementia that they may have like Lewy Bodies or Parkinson's. People living with dementia that have Lewy Bodies may see insects or other brightly colored animals as part of their hallucinations. Objects like different textured carpet may look like bugs crawling on the floor. Hallucinations do not always mean visual but can be auditory or smelling things as well. They may act as if someone is speaking to them or having a full on conversation when in all reality no one is actually present.
If your loved one or someone you know that has dementia that has hallucinations, there are some helpful tips to abide by. Never try to correct the person that is having hallucinations as this will only make them more upset & anxious. Get into "their world" and experience things through their eyes. It is also good to role play. For instance, if they see bugs crawling on the ground, get a broom or vacuum to "clean" up the bugs to make them go away. Then distract/redirect, to an activity in another room. Always listen to what they have to say. Never cut them off and then correct them. If they are having auditory hallucinations, make sure there hearing is checked or hearing aides are checked first.
Infections can cause hallucinations as well so it is always good the rule these out first. Infections like UTI's or pneumonia can cause these same side effects. Always reach out to their doctor to find the best result for your loved one. Remember, that those living with dementia are not trying to give you a hard time, they are having a hard time.