Many people are ending their evening with a small indulgence of dark chocolate - especially since the reports that dark chocolate can be heart healthy. However, you may want to change that timing of your sweet treat if you are having trouble sleeping. While 1.5 oz milk chocolate has minimal caffeine (about 9 mg), the same amount of dark chocolate has about 30 mg caffeine (the just slightly less than the amount in a cup of tea - 40 mg). In addition, there is another compound in dark chocolate called "theobromine" that increases heart rate and can contribute to sleeplessness.
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