My father is sharper early in the day. As the day wears on, he becomes less engaging, more confused.
But he’s up early and then early to bed.
Same with my Mom. She’s more “with it” in the mornings. As the day wears on, or she gets ‘stressed’ the forgetfullness kicks in.
Excessive sleeping is also apparent, though I’m having her checked for depression as well.
I give her as little choice as possible when it comes to doing things. Keep it positive.