How to encourage sleep at night?

Dad is 94, living with us over five years now. Since a recent hospitalization where he endured hospital delirium for the first time, his vision has worsened and he cannot read even on the largest font. Reading and playing games on his reader, were primary home activities for him. (Have had checked and no detached retinas or bleeding, there is hope some acuity will return.)He refuses audio books. He doesn’t enjoy TV—saying he can’t see it well (and I think his hearing is worse too). He will listen to it a bit, and music. He is much weaker after this hospitalization, and after three weeks is still not the same cognitively. He is a very high fall risk due to neuropathy in both feet.
I try to take him out somewhere every day, where he can get some walking and variety of experience. A meal, shopping (using wheelchair for that due to amount of walking), garden center, park, etc. . He also usually has several doctors appointments every week, a home nurse to check on him twice a week, and PT before this hospitalization (and it will resume soon). But with my husband newly retired, and household chores, I cannot entertain dad ALL day. So he sleeps. And recently he sleeps to the extent that he tells me to “go away” because, he wants to sleep. But then EVERY night he gets up. Sometimes “up” for the day, at three am. (Then snoozing in his recliner throughout the day.) Sometimes just for a while then back to bed, at two am then up and down several times. And sometimes, like right now, he decides to go out on the front porch to smoke and sit—at four, five, six am. With his bedroom right next to ours, and purposely leaving his door and the front door very squeaky, I wake up to keep an eye on him (he leans on his walker so hard it groans along the hard floors and I wake up). He often doesn’t Velcro his shoes tight enough and can fall as a result, he can’t recline his recliner far enough any more to get his feet up to an effective level to fight edema (and refuses a lift chair or any other chair—this one was my moms and means a lot to him, so I lift it up for him), etc. In fairness, once he is settled in his recliner, I can nap until he gets up again. Not only am I becoming ridiculously exhausted, but I sometimes startle awake at his usual times, even when he hasn’t gotten up—just out of habit (which makes it worse because then I might just be getting back to sleep when he does get up). My husbands sleep is now being interrupted along with all the other concessions he is having to make in this situation, which is becoming a problem.
I know many will say, especially with my other posts, that it is nursing home time. And with two of his docs recommending hospice, things may evolve to the point that that is the only thing that will work, as I am it as far as caregiving goes and due to a health history of his I am told hired caregiving help will not be available. I have been looking at facilities so as to have a plan if necessary (respite was planned at one place but had to be cancelled due to this hospitalization). But for right now, are there any suggestions for helping him to sleep during the night? In the hospital they give him melatonin, but he is such a fall risk that it is a concern for home. Maybe a day program that will keep him busier during the day so he will sleep at night? I feel so terrible, I usually try to hide that he is disrupting, etc so he doesn’t feel bad, but when he went outside in the night this morning I was visibly annoyed and told him he is waking everyone up and that going outside where he could fall and if we did manage to stay asleep, no one would know, so was not ok. I never show annoyance like that to him, he really can’t help it and isn’t asking for anything….sorry for this overtired and emotional and long post.