At least one study has shown that, in some people, caffeine is not metabolized efficiently, leaving you feeling its effects long after consumption. So, an afternoon cup of coffee or tea will keep some people from falling asleep at night.
Be aware that some medications also contain caffeine (for example, some over-the-counter pain relievers and cold and decongestion products may contain caffeine).1Sleep — Why You Need It and 50 Ways to Improve It
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