How well do you remember your dreams? Have you ever had a dream about something you were doing earlier in the day—especially if you were doing it when you nodded off? If you’re a sleep researcher, like Harvard psychiatrist Robert Stickgold, who wants to induce a specific dream in your patients, Tetris is apparently the way to go. He had subjects play the popular video game before going to sleep, and then had them record their dreams when they woke up. What was really interesting though, is what happened when he conducted the same experiment on amnesiacs.

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