Not too long ago my grandpa started getting night memory loss. Only at night though. Some people think it might be dementia. At night he starts moving his arms around. He even talks to himself or just talks. He already went to the doctor but they didn't know what it was.
Yes dementia is always a concern among people that are elderly when they encounter changes as you described. However dementia generally doesnt vary from day to night and doesnt involve involuntary movements. Have they ruled out the potential of nocturnal seizures by conducting an eeg and especially an eeg with a sleep test overnight? However of course only a doctor would understand the clinical specifics. But if the doctor examining him couldn't come to any conclusions it would be worthwhile to find a referral to a neurologist who is a gerontologist as well who could further follow up and provide a conclusive diagnosis and treatment.
I was under the impression that dementia DID worsen at night -what they call "sundown" syndrome in the medical field. Symptoms, paranoia, depression, forgetfulness, etc - they all tend to get worse in the evenings.
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