Problem: Over the past month, Mr Dennis has expressed concerns that someone in the facility wants to harm him and that "nothing is real." With no apparent trigger, he has repeatedly become increasingly volatile and physically aggressive toward co-residents. At other times he appears entirely lucid and engages appropriately with staff and co-residents. His sleep is erratic, and he has been observed thrashing his legs in his bed on nightly rounds. He is eating well, has normal bowel and bladder function, and denies any pain. There are no intercurrent medical illnesses and no infectious symptoms noted. There is no known family psychiatric history. What are some differential diagnoses for Mr Dennis? Need Assignment Help?