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Measures included an ankle worn activity monitor, an external light monitor and the Barr Baby Day Diary in which parents recorded periods of sleep, crying, feeding and other behaviours at 5\u2010min intervals throughout the 24\u2010h period. Fifty\u2010six babies (26 males and 30 females) were monitored across three consecutive days at 6, 9 and 12\u2003weeks of age. There was an early evening peak in crying which was associated with reduced sleep at 6\u2003weeks. Across the trials there was a gradual shift towards a greater proportion of sleep occurring at night. Sleeping well at 6\u2003weeks was a good indication of more night\u2010time sleep at 9 and 12\u2003weeks. Babies who slept well at night were exposed to significantly more light in the early afternoon period. These data suggest that light in the normal domestic setting influences the development of the circadian system.<\/jats:p>","DOI":"10.1111\/j.1365-2869.2004.00435.x","type":"journal-article","created":{"date-parts":[[2004,11,22]],"date-time":"2004-11-22T14:44:43Z","timestamp":1101134683000},"page":"345-352","source":"Crossref","is-referenced-by-count":41,"title":["The relationship between daytime exposure to light and night\u2010time sleep in 6\u201312\u2010week\u2010old infants"],"prefix":"10.1111","volume":"13","author":[{"given":"Yvonne","family":"Harrison","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2004,11,22]]},"reference":[{"key":"e_1_2_16_2_1","doi-asserted-by":"publisher","DOI":"10.1159\/000068571"},{"key":"e_1_2_16_3_1","doi-asserted-by":"publisher","DOI":"10.1136\/adc.63.4.380"},{"key":"e_1_2_16_4_1","first-page":"39","article-title":"Melatonin treatment stabilizes chronobiologic and cognitive symptoms in Alzheimer's disease","volume":"21","author":"Brusco L. 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