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Parents, let sleeping teenagers lie If you are tired at 11 p.m. and dream of going

to bed while your teenage daughter or son is playing a computer game, chatting to friends or watching something online, don't worry. This is a normal thing with teens. While most adults start to produce melatonin (the hormone which helps us sleep) around 10 p.m., teenagers begin to produce it at about 1 a.m. We don't know if it is caused by the changes in the brain, or by their habits (the light from computer and TV screens may keep the brain from falling asleep). However, we do know that teens need more sleep than they get as they grow up. Some schools in America, which start their classes later, have already started noticing positive changes in their pupils' learning.

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