According to a recent study, obese teenagers who don’t get enough sleep may have problems with insulin secretion and blood sugar levels:

And teens  who don’t sleep enough are more likely to be depressed, to drink sugared soda, to smoke cigarettes and so forth:

And other studies suggests lack of sleep may impact brain wiring:

While teenagers who go to bed early are much less likely to be obese and have a better chance of being physically fit:

And further information on the importance of sleep for teens:

A different study suggests teens may sleep TOO MUCH:

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