In West Africa, people have long chewed kola nuts as stimulants, because they contain caffeine that also occurs naturally in tea, coffee, and chocolate.

在西非，人们长期以来都咀嚼可乐果作为兴奋剂，因为它们含有在茶、咖啡和巧克力中天然存在的咖啡因。

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Keep in mind, energy drinks, cola, chocolate and certain teas also contain caffeine. Your best bet is to avoid caffeine about six hours before bed.

要记住功，能性饮料、可乐、巧克力、还有特定的茶叶都含有咖啡因，睡前大约六小时就最好不要碰还有含有咖啡因的食物。

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Do not drink coffee before going to bed, drink, Coca-Cola and chocolate contain caffeine and exciting things like, eat it will make people excited people are likely to be difficult to sleep.

在睡前不要喝咖啡、喝酒、可口可乐和巧克力等含有让人兴奋的咖啡因类的东西，吃了这些东西容易使人感到兴奋会使人很难入睡。

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They say passengers who sit for hours need to drink plenty of water not liquids that contain alcohol or caffeine.

VOA: special.2009.07.14

In recent years, controversy has also swirled around energy drinks, which also contain caffeine.

CNN: Wrigley halts production of caffeine gum

Most of the stimulating supplements are derived from the herbal plant ma huang, and often also contain caffeine derived from guarana.

BBC: Dietary supplement 'can kill'

Although some coffees may contain more caffeine than Monster's energy drinks, Herrera says that coffee is typically served hot and consumed more slowly than energy drinks.

NPR: San Francisco City Attorney Sues Monster Beverage