Onions may make you cry, but they are extremely good for your health. Along with garlic, leeks and chives, onions belong to the allium (lily) family, which contain sulphur compounds. While these compounds have a strong pungent odour that can be irritating to some, they contain very useful antimicrobial elements which fight a lot of harmful bacteria like salmonella and E. coli. This sulphur content also helps to prevent platelet clumping; in fact you will probably be surprised at the numerous health benefits of onions.1. An onion left in an open jar beside your bed will help with relaxation, clear breathing and aid restful sleep which will in turn reduce snoring, as well as coughs and wheezes. This aid to insomnia has the added benefit of repelling insects while you sleep.