As many have said, take a break -- you're not being graded on this.
When I've had enough reading for a while I switch to writing. If I don't really want to get involved in stories anymore (reading or writing) I do crossword puzzles. If I get to the point that I don't even want to see words anymore, I do Sudoku.
And, if the weather cooperates, get out of the house and take a walk.
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