Lack of Morning Light Keeping Teenagers Up at Night (3 of 3) (IMAGE)

Rensselaer Polytechnic Institute

Lack of Morning Light Keeping Teenagers Up at Night (3 of 3)

Caption

Maggie Respass looks through a book in the library of Smith Middle School in North Carolina while participating in a 2009 study on how light impacts teens' sleep patterns. She is wearing a personal light-measuring device, called a Daysimeter, to measure her daily rest and activity patterns, as well as her exposure to circadian light -- short-wavelength light, particularly natural light from the blue sky, that stimulates the circadian system.

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Rensselaer Polytechnic Institute

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