Because nobody could see them at night, because Atticus would be so deep in a book he wouldn’t hear the Kingdom coming, because if Boo Radley killed them they’d miss school instead of vacation, and because it was easier to see inside a dark house in the dark than in the daytime, did I understand?
– Harper Lee
To Kill a Mockingbird, Chapter 6. Jem and Dill give Scout reasons why they chose this night to steal into Radleys’ yard to sneak a look at Boo through the window.