HERE’S A THOUGHT experiment for you: Imagine you found out that when you go to sleep at night, you don’t just go to sleep. You die. You die, and someone else wakes up in your place the next morning. He’s got all your memories. He’s got all your hopes and dreams and fears and wishes. He thinks he’s you, and all your friends and loved ones do too. He’s not you, though, and you’re not the guy who went to sleep the night before. You’ve only existed since this morning, and you will cease to exist when you close your eyes tonight. Ask yourself—would it make any practical difference in your life? Is
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