My 94 yo father’s cognition took a big hit during hospitalizations this year. It improved with the increased daylight hours & sunshine of spring & summer. But the time change & decreasing light & unwillingness to go outside bc of cold seem to have brought back sundowning behaviors. Specifically a general grumpiness & irritability, lack of engagement, increased word finding difficulty, and a resistance to going to bed. He That’s the big one-the more tired he gets the more he rebels.. He walks around and starts to obsess or rummage. He has to climb 16 steps to bed & self cath. These become increasingly difficult to do when he’s tired. His processing decreases and his hands start to shake. I'm also fearful he will revert to his post hospital fatigue state of psycho motor retardation & a seizure like episode. After a couple hours sleep he would be much improved when he woke up for toileting despite middle of the night. If it weren't for the cathing & the stairs & the like a Parkinson's patient off meds motor skills I'd just let him tire himself out & sleep in his chair downstairs. He has no insight or judgment at this time so no amount of explaining helps. I have video of what happens when he’s too tired but no impact. He’s especially resistive to me- because it's his child telling him what to do I suspect. But now to night caregivers he normally responds well to. I know I have a lot of fear because of what’s happened in the past & that doesn't help. Could light therapy help? I've found inconclusive or vague info - no protocol-on internet. Any other suggestions welcome.