It does not say what effect this has on relationships or important activities, such as sleep.

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High school students in particular are facing greater academic pressure and college competition than ever before, and all those AP classes and extracurricular activities can eat into sleep time.

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They had been planning to attend political training classes and participate in group activities during the day and sleep in tents at night, he said.

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Psychiatrists, therapists, self-help books - everyone recommends good "sleep hygiene", regular exercise, structured social activities and, above all, taking your medication daily and on time.

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Or rather, if you geotag your tweets and photos as carelessly as the average microblogger, they know where you sleep, work, and potentially engage in far more private activities.

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