Dr Neil Stanley Independent Sleep Expert
BACK Interestingly in Fire : The Spark That Ignited Human Evolution by Frances D. Burton  University of New Mexico Press 2009 here the author, a professor of Anthropology, suggest that the light from sitting close to a campfire would be sufficient to alter circadian rhythms, if that is indeed the case then it would suggest man has been doing this, perhaps inadvertently, for 300,000-400,000 years Charles A. Czeisler, ‘Light’, in Mary A. Carskadon (ed.), Encyclopedia of Sleep and Dreaming (New York, 1993), 329. See also Kenneth P. Wright Jr et al., ‘Entrainment of the Human Circadian Clock to the Natural Light–Dark Cycle’, Current Biology, 19 Aug. 2013; here   C. A. Czeisler and J. J. Gooley, ‘Sleep and Circadian Rhythms in Humans’, Cold Spring Harbor Symposia in Quantitative Biology, lxxii (2007); here  C. A. Czeisler, ‘The Effects of Light on the Human Circadian Pacemaker’, in Derek J. Chadwick and Kate Ackrill (eds.), Circadian Clocks and their Adjustment (Chichester, 1995); Charles A. Czeisler and Kenneth P. Wright Jr, ‘Influence of Light on Circadian Rhythmicity in Humans’, in Fred W. Turek and Phyllis C. Zee (eds.), Regulation of Sleep and Circadian Rhythms (New York, 1999). B. Claustrat, ‘L’Evolution du rythme veille-sommeil au cours  de  l’histoire  de  l’humanite´. Influence de la lumie`re artificielle’, Me´dicine du Sommeil, xi (2014). here    BACK
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