My sleep rhythm is completely lost and now I want to ask what you can do at night. It should be as quiet as possible since I don't live alone.
If possible, suggestions where you don't have to use your cell phone or laptop.
Read a book
Read or write book, tinker, learn new language, learn / improve fonts, reflect
Read
Listen to audio books
Listening to music (with headphones)
To draw
Daydreaming
if possible you can also go for a walk outside
I have the TV on quietly, Phoenix, ZDF Info have good documentaries with sonorous voices that make you tired of listening carefully, and I often fall asleep.
Maybe that will work for you too.