So I left a more detailed answer, but I would say try to find other things to do that don't require a screen at night. Yes, a tablet can make time pass easily, but so can lots of other things as long as you enjoy them. Read a book, maybe try drawing something. Sudoku or crosswords can be good as well. I like having things to do with my hands, so I've gotten into card magic and origami recently.
So I left a more detailed answer, but I would say try to find other things to do that don't require a screen at night. Yes, a tablet can make time pass easily, but so can lots of other things as long as you enjoy them. Read a book, maybe try drawing something. Sudoku or crosswords can be good as well. I like having things to do with my hands, so I've gotten into card magic and origami recently.