“Have trouble getting to sleep? Try 10 minutes of Tetris. Recent research has demonstrated that Tetris—or Candy Crush Saga or Bejeweled—can help overwrite negative visualization, which has applications for addiction (such as overeating), preventing PTSD, and, in my case, onset insomnia. As Jane explains, due to the visually intensive, problem-solving characteristics of these games: “You see visual flashbacks [e.g., the blocks falling or the pieces swapping]. They occupy the visual processing center of your brain so that you cannot imagine the thing that you’re craving [or obsessing over, which are also highly visual]. This effect can last 3 or 4 hours. It also turns out that if you play Tetris after witnessing a traumatic event [ideally within 6 hours, but it’s been demonstrated at 24 hours], it prevents flashbacks and lowers symptoms of post-traumatic stress disorder.””

— Tools of Titans: The Tactics, Routines, and Habits of Billionaires, Icons, and World-Class Performers by Timothy Ferriss