The Timing of the Melatonin Onset and Phase Angle to Sleep Onset in Older Adults after Uncontrolled vs. Controlled Lighting Conditions.

In Project A, the average DLMO on Night 2 was later than on Night 1, as would be expected given that the intrinsic period of the central circadian pacemaker is longer than 24 h and that the participants were exposed to brighter light on the morning of Day 1, although the difference (20 min) did not reach statistical significance in this small study sample.

also in 111,027 other papers