Hi- My 99 yr old old suffered a mild stroke this past memorial day. He was release to me four days later. He seems to have mental issues, ie. can t sleep, confused, restlessness. Seems to come late in the afternoon, to bedtime. His doctor has him on haloperidol 0.5mg, and now on 1.0mg. Is it the right med. for my dad. Could he also be suffering from sundowner syndrome?