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. Author manuscript; available in PMC: 2007 Dec 1.

Published in final edited form as: Neurobiol Aging. 2005 Nov 23;27(12):1870–1879. doi: 10.1016/j.neurobiolaging.2005.10.011

Correlation between habitual sleep offset and the magnitude of light-induced phase delays. A) There was no association between sleep offset and phase delays in the younger subjects. B) In the older subjects, the magnitude of phase delays was significantly correlated with habitual time of awakening (r = 0.70, p = 0.008), with earlier wake time associated with smaller phase delays.

Correlation between habitual sleep offset and the magnitude of light-induced phase delays. A) There was no association between sleep offset and phase delays in the younger subjects. B) In the older subjects, the magnitude of phase delays was significantly correlated with habitual time of awakening (r = 0.70, p = 0.008), with earlier wake time associated with smaller phase delays.