What can I do when my grandmother doesn’t want to go to bed?

does the tv have a night time dimmer on it? lower the sound after 9 pm. does she have roommmtes?
If no roommates, and bed ridden, she doesn't go anywhere... let her be....

how about books on tape? so she can just listen a bit...

dim the the tv lights, and lower volume after 9 pm... get that put into place. maybe that will help.

honestly my mom was placed with a person who had to have tv on 24/7. I didn't realize, it WAS 24/7 TV ON AND FULL VOLUME 24/7... that was because mom could not talk. she could not complain. HOW AWEFUL I WAS FOR NOT DEFENDING HER.
your mom is by herself...correct? then what is the deal? dim the the tv light and volume at a given time.... They have this technology on cell phones, they should have it for tv's

My 96 year old mother is competent and lives alone in her house. She sleeps all day and is literally up all night. It’s her schedule.

I would leave grandma alone. Let her be up all night and let her sleep during the day. It’s not causing any harm. Some people are just wired that way. They are just night owls.

I work the overnight shift and so I am up all night and sleep all day. It is what it is. Leave her be.

Can you put a timer on the TV plug/cord? It will turn off the TV at a set time by itself. You won't have to do anything once you set it up and plug it in. When grandma asks why her TV turns off, you can make up some excuses. Say the fuse was blown, TV got too hot and turned itself off, outlet not working, anything. See if it forces her to go sleep. Hopefully it will. You can find those timers at Walmart, Target, Home Depot, or online. They are inexpensive and not hard to set up. Good luck.

Does her having the TV on all night bother you or keep you awake? If not, I would just let her be. If she's bedridden, there's really not much else she can do is there?
My husband who was bedridden for 22 months before he recently died, would have the TV on in the living room 24/7, as his hospital bed was in that room and he couldn't do much else. He would usually fall asleep at some point in the evening or early morning, and I would go in and turn it down some so I could sleep better in our bedroom, as I like it quiet when I sleep.
Her confusion might be coming from some mental decline as well, and not just lack of sleep(sorry I didn't read your profile to see if that was the case)so I again would just let her be, and in the future if she just gets to be too much for you, you may have to think of placing her in the proper facility. Wishing you the best.