Everyday health, explained

Rehydration, heat, sleep, vaccines: everyday health decisions are easier when you understand how the body and the health system work.

This topic explains health basics from official and medical sources. It is general information, not medical advice, so always ask a doctor about your own situation.

Topic last reviewed 3 November 2026

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  1. How Much Sleep Do You Really Need? A Guide by Age

    Sleep experts recommend at least seven hours a night for adults, and much more for children and teenagers. Here are the recommended hours for every age, signs you aren’t getting enough, and habits that help.

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    A simple mix of salt, sugar and water has saved millions of lives. Here’s how oral rehydration solution pulls water back into the body, what the WHO recipe contains, and why sugary “electrolyte” drinks are not the same thing.

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