My mom has dementia and is on aricept (10 mg) for about 7 months. When my dad was dying she couldn't remember who I was or who my husband was. The memory lasp only lasted a little while. We attributed that to the trauma of my dad dying. He died this past January. Since then she has been pretty good. She definitely remembers things in her past better than what happened yesterday. I guess what concerned me is this morning when I went in to get her up she said she had a bad nightmare. When I asked her what it was about she looked do confused and said she didn't know her name. Then she asked who I was. Couldn't remember my dad let alone him dying. Couldn't remember her family members dying, she's the last one living in her family. My mom is 90. She seemed fine when she went to bed last night. Is this a normal part of dementia? To be fine one day and totally mixed up the next? She has come back around somewhat now that she is up and has had her breakfast. Just guess it caught me off guard and not sure what to expect.