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Not all blindness causes free-running rhythms; these findings do not establish general insomnia efficacy.\nexposure: 10 mg daily before preferred bedtime; three participants later tapered to 0.5 mg after entrainment\nevidence_span: {\"source_cache\": \"artifacts/melatonin-research/11027741.abstract.txt\", \"locator\": \"Primary indexed abstract; zero-based, end-exclusive Unicode character offsets\", \"file_sha256\": \"ef0d484e68b993c88b611d48f4cd8dc16db62056baa76f41f508818cccf78641\", \"start_char\": 0, \"end_char\": 1749, \"text_sha256\": \"ef0d484e68b993c88b611d48f4cd8dc16db62056baa76f41f508818cccf78641\"}\n[melatonin-p11027741] Entrainment of free-running circadian rhythms by melatonin in blind people. 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