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His sleepiness can be related to his age and his dementia and related to his naps he is taking in the afternoon.
It can be difficult for someone his age and with his dementia to break the cycle of napping and sleeping late at night time
Many patients who have dementia sometimes feel better at night time and want to stay up later and thus become more fatigued for the next time and then have a harder time falling asleep until late. It can become a vicious cycle.
He should talk to his doctor about medications like Melatonin or other sleep aids he can use before bed to help him become sleepy and sleep better earlier which could help him not to nave to take naps or shorter naps during the day.
He should get his thyroid hormone levels checked as well.
His hypothalamic asymmetry could be part of the cause of his dementia as well
Let me know if you have questions.