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Do Not Drink Caffeine Excessively and Avoid Sleep-Interfering Substances . C. affeine . effects can . last up to 5 hours after ingestio. n. Caffeine makes . initiating sleep. more difficult and can even fragment sleep cycles. If you drink caffeine, i.e. sodas, teas, other beverages, do so. before 1300. Cigar. ettes, alcohol . and over-the ... ................
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