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Energy drinks are advertised as a quick way to feel switched on. Many contain caffeine, and some contain a lot of added sugar. Caffeine can make someone feel more alert for a while, but it may also cause a racing heartbeat, shakiness, headaches or difficulty sleeping. Effects vary from person to person, and having caffeine late in the day can make sleep harder. Having energy drinks often can contribute to ongoing sleep difficulties. Sugary and acidic drinks can also harm teeth over time. Energy drinks are not a substitute for sleep, food or water, and health authorities advise children and young people to avoid them. If you feel worn out, consider water if you are thirsty, a nourishing snack if you are hungry, and a regular sleep routine. For most everyday activity, water is a suitable drink. Sports drinks are generally intended for prolonged, vigorous exercise, rather than ordinary school days.