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。
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.
该研究称，手机产生的辐射会导致失眠和头痛，而且会缩短深度睡眠的时间。
It claims that radiation from the handset can cause insomnia and headaches as well as cutting the time spent in deep sleep.
使用育亨宾树树皮引起的轻微副作用包括：胃部不适、呕吐、睡眠不规律、高血压、头痛、亢奋、皮疹以及心跳加快。
Minor side effects of taking yohimbe bark include upset stomach, vomiting, irregular sleep patterns, elevated blood pressure, headaches, irritability, skin rashes, and rapid heartbeat.
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