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“Sleep Dealer,” the feature directing debut of Alex Rivera (who wrote the screenplay with David Riker), is an unusually thoughtful science fiction film, using the speculative energy of the genre to explore some troubling and complex contemporary issues. Set mostly in Mexico, it imagines a future in which local water rights have been snatched up by multinational corporations, and in which people connect to a virtual-reality cybernetwork by means of “nodes,” electronic jacks implanted in their arms and necks.