Featured series 
Tag: Charles A. Czeisler
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Nation & World
Chronic sleep loss degrades nighttime performance
Although the exact function of sleep remains unknown, sleep is clearly necessary for optimal cognitive performance, learning, and memory.
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Nation & World
Doctor fatigue hurting patients
Too many 24-hour shifts worked by hospital interns cause medical mistakes that harm and may even kill patients, according to a new Harvard Medical School study. Doctors in training who…
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Nation & World
Melatonin most effective for sleep when taken for off-hour sleeping
Researchers from the Divisions of Sleep Medicine at Brigham and Women’s Hospital and Harvard Medical School have found in a double-blind placebo-controlled clinical study that melatonin, taken orally during non-typical…
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Nation & World
Blue light special
Jet-setters and shift workers now sit in front of glaring white lights to readjust their body rhythms and avoid sleep and alertness problems. New experiments condcuted by Harvard University researchers…
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Nation & World
Are you an ‘early bird’ or a ‘night owl’?
Harvard researchers working at Brigham and Women’s Hospital have found that whether someone is a morning person or an evening person depends on a basic aspect of the circadian timing…