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This was a good book. It's short and free on Project Gutenberg. The idea of dreaming at the very end (no reason to spoil it) stands up to modern science of dreaming. There's a good explanation of what you need to do to enter "dream" or "dream-like" states. There's also a detailed explanation of how outside stimuli of different types can effect the dreaming process. Bergson did plenty of reading on dreams and thankfully kept this essay relatively short.