My father has Dementia (he s 89) and diabetes , Until recently he s been fairly active. Lately he s loosing a lot of mobility and sleeping soundly through the night and in between meals. He s sleeping most of the day and is less and less mobile. Is this normal for an 89 year old? Is this end-stage? His numbers, BP , Blood Sugar , Heart Rate are all normal for a person his age (per his doctors). We are worried about the change, from sleeping little at night and napping during the day to sleeping all night (sometimes late into the morning 8-9 a.m.) and sleeping between meals. Any advise is appreciated.