Many people feel that caffeine increases their mental alertness. Higher doses of caffeine can cause anxiety, dizziness, headaches, and the jitters. Caffeine can also interfere with normal sleep.

许多人感觉咖啡因可以使他们的神智更加清楚。高剂量的咖啡可以引起焦虑、头晕、头痛、紧张不安，亦会影响正常睡眠。

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Many people feel that caffeine increases their mental alertness. Higher doses of caffeine can cause anxiety, dizziness, headaches, and the jitters. Caffeine can also interfere with normal sleep.

许多人感觉咖啡因可以使他们的神智更加清楚。高剂量的咖啡可以引起焦虑、头晕、头痛、紧张不安，亦会影响正常睡眠。

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