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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 phase angle and the magnitude of light-induced phase delays. Phase angle was calculated as the interval between melatonin midpoint and habitual sleep offset. A) There was no association between phase angle and phase delays in the younger subjects. B) In the older group of subjects, the magnitude of phase delays was significantly correlated with phase angle r = 0.68, p = 0.010). A shorter interval between melatonin midpoint and sleep offset was associated with smaller phase delays.

Correlation between phase angle and the magnitude of light-induced phase delays. Phase angle was calculated as the interval between melatonin midpoint and habitual sleep offset. A) There was no association between phase angle and phase delays in the younger subjects. B) In the older group of subjects, the magnitude of phase delays was significantly correlated with phase angle r = 0.68, p = 0.010). A shorter interval between melatonin midpoint and sleep offset was associated with smaller phase delays.