My daddy (who has Alzheimer's) frets if I don't call every night at 8 pm. Usually I can do this. But on occasions (like when I'm out at a movie, watching a play or even cooking a late dinner) I can't. I tell him (he can't remember) and my aunt (his care provider) that I'll be gone that night, but... If 8 o'clock comes and I'm not calling he gets upset. Any suggestions.