My 86-year old mother has been taking the oral form of morphine for about 4 weeks. After about two weeks she started becoming very confused (not knowing the day of the week, forgetting she had spoken to me on the phone, believing we were going on a trip, etc.) and hallucinating (believing people were at her home when they were not, believing she had held a phone conversation with someone when she had not, etc). Could this be a side effect of the morphine?