My 83 year old spouse has been diagnosed with dementia for a year now although he has been progressively going downhill for 4 yrs. He has lost all zest for life, not interested in gardening or travel which he loved previously. In the last 6 months he sleeps all night and until 4 or 5 in the afternoon. The doctor says let him sleep. But is this just a normal progression of the disease? And how do I handle the loneliness?